I've been using the Smoke for a couple of years now. Temps are accurate within a degree, radio range is very good. The wifi gateway feature (separate purchase) and app are not that great. Gives basic info, some limited graphing features, allows you to monitor two probes from anywhere you have internet access (I think it's only iOS supported), but seems like kind of an afterthought.
I've been eyeing the Fireboard product (more probes, very cool remote app, able to share real-time cooks with other people, etc), but the Smoke is so solid, it's hard to justify switching... Maybe Santa will drop one in my stocking this Christmas.