i use it and like it. it looks pretty lame, but the buttons have a better feel than the stock controllers.

you can also drive one car and charge another which is kinda cool.

the stupid purple charger cover is annoying, as you cant charge a car and set the controller down with out the cover getting in the way. sometimes it can knock the car off if you arent careful.

the standard booster controllers suck. the boost button is just slapped onto the top of a normal controller, and it feels awkward.