Not sure about the pro version, but I have the 2nd gen and they're definitely NOT worth it. Mine doesn't really slip out, but there's intermittent audio lag, and about 33% of the time they don't auto connect so you have to manually do it. The audio quality isn't anything special. There's no bass to it so it just sounds as if you're listening straight from your device without headphones. Maybe pro version is improved, but battery wise they dropped it from 5 hours to 4.5 hours which I already felt was a bit too short to begin with.
The good point are that they're light, feels like you're not wearing any, and they charge fast. But other than that, I wouldn't recommend it really since there's probably better options out there.