This is admittedly not a huge problem, but is fairly frustrating. I just purchased a Garmin Forerunner 245 (non-music). I tried the 245M, but had the sticky button issue. I then used a Forerunner 45 which was okay, but my wife is now using. Decided to give the 245 line another go.
I just unboxed it this morning and have not run or exercised at all with it, and already it has a decent scuff/dent in the body of it. It has not been moved, absent laying it on a microfiber to set it up. It's in the front left lug, and is visible when the watch is sitting on your wrist.
Again, this is a small, cosmetic issue - but on watches this expensive, it's pretty amazing. You'd never get an Apple Watch with a dent out of it out-of-the-box.