I'd like to pipe in with a quick praise for what I consider this product's primary strong point, durability & longevity.
I've used lots of wireless IEMs, some really good ones too that sound better than these. But these have become my go-to for the gym. Other wireless IEMs I've tested slowly disintegrate under my gym-use, I've never had one that last a full year. Problems include one channel going out, or the joining (behind the neck) cable wearing out and coming apart.
I got these as soon as they first hit the market, I've been using them solid for at least over a year, maybe closer to two years now, I don't remember the exact date I got them.
I've put some Comply tips on them and it helps the sound quality. SQ isn't bad, but I've heard better and Comply eartips add a bit more punch and bass to the overall presentation which fits my workout playlists that consists of more metal, aggressive EDM and hip-hop/metal crossover songs.
The case is a great shape for sliding into my pocket and not leaving an alarming bulge in my pants. The battery life easily exceeds my workouts. I've even heat stressed them by bringing them into the sauna with me several times, using the left only so I can listen to podcasts. Eventually the bud turned off on me, I assumed it was heat and humidity so I put it back in the charger case and didn't try that again. But, after some time to recharge and cool off it worked for fine ever since.
The secure fit is good, and I was skeptical considering how much of it sticks out of my head, but it's balanced nicely. Comply eartips definitely solidifies the fit and make them even more comfortable.
I've read some people having problems with one bud not charging correctly, I haven't had that issue with these but did have it with some cheaper models I tested. Generally, you'll want to try to keep those contacts clean and ensure they are actually making contact. Otherwise, if you experience that problem I guess it's just FUBAR. That was the case with the aofrementioned cheaper ones I tested before settling on these.
I don't know how much longer they'll last, I've gone through quite a few wireless IEMs over the years but these have hung on for the longest of any I've used. If they go out on me, I'd think nothing of joining this drop.