Those park flyers don't work well if there's even the slightest breeze. They weigh next to nothing (that's how you can run them off of a lightweight electric engine), and if you try to fly them in a breeze, they'll fly backwards and be almost impossible to control.

I get the impression that the places you run the wind buggy are generally somewhat windy all the time, otherwise you wouldn't be dragging the buggies out there at all in the first place.

I'll let Tod come in here and give his opinion on which kits are the best to start with.