I got this device when it was still around $40. I would say especially now the price has got down, it is certainly a worthwhile investment to convert a dumb garage door opener into a smart one that you can control via your smartphone or allow Amazon Key access through the Key app.Here are my general thoughts on this device:The good:1. Great battery life - Since it uses a larger-sized coin battery, a single battery usually gets about 10 months of operation in my case during normal operation.2. The device was quite easy to set up with my old LiftMaster Professional garage door opener that did not support any smart connectivity.3. Open/close push notifications are generally instantaneous and have been consistently reliable.4. Status readings are accurate in real-time and the apps give a good history as far as when your garage door is opened/closed.5. Guest user sharing that allows you to share access outside of your main account. However, sharing is location-based, and access cannot be delegated down to specific sensors.6. Orientation sensors mounted on the garage door allow you to sense door activity without physically modifying the garage door (just a sticky tape mount on the garage door itself).7. Amazon can actually deliver packages in the garage without leaving them at the doorstep.The not so good:1. There is approximately a five-second delay between when a close command is issued through the app and when your garage door actually begins to close. During that delay, the main unit emits constant, loud warning beeps warning others to clear the area. I find this feature annoying since it adds a delay to when you have to wait for your garage door to close and the warning beeps may startle others (like your neighbors) at night thinking that it may be some kind of break-in. There are no official ways to disable this feature, although you can open the unit and desolder the speaker so the annoying beeping can be stopped. Alternatively, using the physical button can also avoid this issue (but this only works if you have a physical remote to use as well).2. The device only supports 2.4Ghz wireless connections and would not connect if WPA3 is enabled on your device, even in mixed WPA3+WPA2 PSK mode. This means that if you have purchased a newer router that supports WPA3, enabling it will prevent the main unit from connecting to it altogether. In those cases, you will either have to fall back to WPA2-PSK only mode or create an alternate network for IoT devices that support only WPA2-PSK on the 2.4Ghz spectrum.3. Connections are not the most stable and sometimes you will suddenly receive notifications that your device has gone offline, even if all of your other devices are fine and are connected to the Internet. Generally, the device will fix itself within 15 minutes when this happens, but during that time you would not be able to open/close your garage door via the app.4. Amazon Key activity is not always recorded - It seems like Amazon Key uses a different API to send door open/close activities to the garage door opener and their activities are not always 100% recorded in the garage door MyQ history. Although I have not had any thefts relating to this so far, having this happen without a record is somewhat concerning to me. You can tell this is happening because the driver can close your garage door opener without the same annoying beeps that you would otherwise get if you closed it with your app.5. Google Assistant integration is pretty useless - They used to require a subscription for you to even use this, but so far this feature has been pretty useless. This is especially because you can only use this integration to close the garage door or check its status. If you are driving and trying to open the garage door via the assistant, you will simply get a message saying "For security purposes, I cannot open the garage door yet." What is the purpose of using the assistant if this cannot be done hands-free? Additionally, if you have multiple sensors, the MyQ app will often get confused and keep asking you which one you wish to operate. It is just much easier to try to tinker with the app and try to open the garage door that way. Although they have temporarily waived payment for this, I am not sure why someone would pay for this half-baked feature.6. If you have MyQ and the Amazon Key app installed, they both start generating notifications at the same time. Although this is tweakable, this is still somewhat annoying.7. If you ever had to change your Wi-Fi password, you will have to reset the whole system and start the repairing process all over again. I don't know why they can't just allow you to do this in the app before the password change rather than forcing you through the whole process again.8. Although Amazon Key works most of the time, around 20% of the time the driver will elect to still put packages on your doorstep because it takes too long to open and close your garage door, and waiting for your garage door to open and close will cut into their delivery efficiency and rates. I actually have had multiple Amazon drivers shouting obscenities at the camera on different occasions because the garage door is taking too long to respond or they are carrying a large burden for the day. There was a Key delivery for an electronic that was both expensive and sensitive, but in that delivery, the driver ended up putting the package on the side door where my gutters were and the package got all soaked on a rainy day.9. The coin battery, being larger than the standard CR2032 (it uses a CR2450), is more difficult to find in stores and generally more expensive. Although you can still find them online in bulk, it might be more difficult to find something quick when the device is running low in battery.10. It tends to alert about the battery when the battery voltage is still a bit high. I measured the battery voltage of the stock battery which I replaced in which it said low battery, and the battery was still reporting 3.09V. Perhaps there is a high current draw that was causing it to go below a certain threshold, which seemed somewhat unlikely, I think perhaps they are doing this to try to get you to purchase these batteries more often (perhaps directly from Chamberlain themselves).