I have a lensbaby control freak. I bought it for £49 from jessops not realising it should've been £299 but they happily honoured it!
I wasn't massively interested at the time, just thought it was a cheap gimmick,but how wrong was I! This particular model is hard at first as it seems you need more than 2 hands to adjust everything, but after playing around a little I can definitely see potential. I still class myself as a beginner at the mo so haven't really put this to good use, but I'm looking forward to the day when I can really use it properly.
The main thing I stuggle with is the fact that everything is manual. I'm using it on a D90 which means the metering doesn't work, though apparently it does on the higher range and some alternative manufacturer cameras. I'm sure this will come with time as my skills improve, but it is something that may be worth taking into consideration.