I use the Peter Lynn Viper 3.9 "thats the PETER LYNN VIPER"
for buggying and its a great kite, little lift but like most kites will pull your bum off the seat in the right/wrong conditions, fantastic power and great up-wind performance, love it to bits and its so so stable and gives a nice safe feeling when putting on the power. I now fly it on a bar (Flexi extreme) and it turns really well without the brake input.
Airboss held a PL demo day last Sun and the 2 Vipers got a great reaction from everyone who tried them, got to say for the money its a very under-rated kite and a perfect buggy engine.
Also tried the PL Reactor..thats a really nice kite too.