going to have a look at these in a bit, I got interested but never brought any because I watched one mate destroy two little ones and another almost lose one worth £1000 because he pushed it too far...made me a bit nervous about investing in one.
I did like the look of the Parrot one though, with tablet controls, live action camera & "apps" which were different games you could play with them, like dogfights, time trials etc 
