[nabaraz]

All i want is sleep and step tracking. Is this a good option?

[jmcphers]

Probably not if you care about accuracy. Really good sleep tracking requires more sensors than these devices have.

[pornel]

Quite the opposite. Pebble is great at sleep tracking. They manage to do a better job with Pebble's limited sensors than Apple can with all of their hardware. I have both, I use sleep tracking a lot, and I've compared them.