My Basis band is actually the second revision of the hardware ("Basis Carbon Steel" vs "Basis B1"). If you're thinking about buying, I definitely recommend avoiding the 1.0 version, which uses a rather bizarre custom band arrangement that apparently has a nasty habit of falling apart under heavy load; the Carbon Steel version takes a standard 26mm watch band.

And I can't really knock Basis on the hardware score; the device itself is actually quite nice, from build quality to resilience to battery life. Their web UI's not bad, too, but what I really need is an API to pull that data out and integrate it with everything else I'm logging, and it just doesn't seem like they give a damn about publishing something stable, nor as far as I can tell have they ever.

On the whole, I'm pretty equivocal. On the one hand, the Basis device is excellent, and while I can't speak to accuracy, it's quite precise. On the other, the software support isn't sufficient, and the organization doesn't give any indication of being motivated to fix that. I'm not sorry I spent $200 on a Basis band, but you might be; think it over carefully.