My kinda fancy Motorola BT headphones fell apart a few weeks ago, so I ordered these as a pretty cheap replacement. I got them last week, and so far I'm mostly happy.
I mainly use them to listen to podcasts and TV while working out at a gym, and for that, the sound is fine. They paired nicely with both my iPhone and Monoprice BT splitter/transmitter, connecting more reliably then the Moto.
They are very light and don't fit tight on my ears. That's probably good for comfort, but bad if your workout involves tossing your head around. Mine doesn't, so I haven't had any problems so far. They do move around a bit, and need adjusting.
The main thing I miss is the feedback from the device. This one tells me when it is turned on and turned off, that's it. The Moto would also tell me how much battery time was left and whether it was connected. Nothing huge, but I'll probably end up with a dead battery sooner or later without the reminders.
Too soon to say about reliability, but they are so light there don't seem to be any obvious stress points, so I doubt it will just come apart like the Moto did. And it's a 2-pack, so you have a backup waiting when you need it.