I wear my S0 every other night and my S3 the rest of the time. I really like nightstand mode so having one on charge and the other on my wrist overnight works for me. When I'm away, I charge my S3 while I shower and/or while I'm sitting reading or something so I can still use it for sleep tracking. If I'm charging it away from home, I'm likely to have my phone on charge as well so I'd need the extra cable even if there were a puck that took a lightning cable.