No, I agree, £20 isn't much...
My Dad bought one of the early micro rc's a couple of years back, and as you say, virtually uncontrollable. I was given one for my birthday a few months after that, and had the same problem. In fact, I broke it within a few hours of getting it, although a forced landing into a sink full of pots didn't help...
But my brother in law has recently given my son his old one, which although it has had a fair bit of use, is far more stable and controllable than either of the first two were, which is what has set me thinking...
I've done a little research, and found that the latest generation of micro rc's are more controllable. And if you click on the video link for the Airwolf one, that certainly seems to be the case. Assuming it's genuine of course... Still, if it turns out to be crap, £20 will hardly beak the bank...
