I got a set of three of these the last time they were here on woot. I absolutely love them but do have a few words of caution.
These are part of a larger set that would include a main controller that allows you to set groups on different channels. So the directions for use are essentially useless and just are confusing. Also, the remotes are set to work for one setting only. So if you have two receivers within range of each other, the same remote will turn both on. For me this worked out perfectly. I put all of the mood lighting in my bedroom on these. Now I can turn them on and off very easily instead of having to reach awkwardly for in-line switches.
One of my receivers came defective so the range is quite wonky, but the others have decent range. Maybe not 150ft or whatever they say, but certainly inside a room. And the range can be affected somewhat by things in the the way. I have all of my receivers under tables and behind things and rarely have problems, though.
All in all, definitely worth the price if you want something on a remote switch.