I've tried them all, including the August, Friday, Kevo convert and Kevo first generation. The second generation Kevo so far is the only one that has worked 100% of the time for me!
Some of the negative reviews for this lock may in fact be reviewing the first generation version Kevo lock mistakenly. The second generation lock was just released in Spring of 2017.
Installation and configuration of the lock was a little challenging but I was able to handle the entire process myself. As soon as I installed the lock and downloaded the app to my phone, it wanted to do a software update that took approximately 20 to 30 minutes and required keeping my phone within ten feet or so of the lock. So I just laid my phone down inside the front door near the lock while it performed the update. It made a loud beep sound once the update was finished and the remaining setup was a snap.
One comment, the first 2nd generation Kevo lock I purchased had a defective circuit board. I was unable to get it to reset to factory default by pressing the reset button. I was advised by Kevo technical support (waited on hold almost 30 minutes to talk to them) to try exchanging the item, which I did at Best Buy where I purchased this lock. The new one has been working perfectly ever since I installed it roughly 10 days ago!
Bottom line, if you want a Smart Lock that actually works when you approach the door and tap it to unlock consistently, make sure you buy this second generation Kevo and save yourself a lot of headaches and time. This lock also has optional automatic relock which automatically locks the door 30 seconds after it was opened either manually by twisting the knob or using the electronic opening. In other words, with this feature turned on your door is pretty much locked all the time and you have to unlock the deadbolt to exit. This adds an extra layer of security knowing that my door is always locked.