I use Sennheiser HD170 wireless headphones for tracking and monitoring when I need to keep the noise down (I live in a flat).
There is no latency, and the sound quality is fine (I reckon it's down to the headphone quality - not whether or not it's wireless).
I wouldn't use them for mixing, but I don't think I'd use any (wire or wireless) headphones for mixing. Well, none that I can afford anyway