well, if you get a booster REALLY cheap, then go for it - if you don't mind the long bag
(not good when flying -> your kitebag'll be bigger than your boardbag).
if not, buy used stuff -for example airblast 2001 (but watch the mylar), arx or north rhino...
it's better to have fun on the water and a pissed off bank accountant than a satisfied one and bad equipment
you should be somehow experienced -> like i told:
the booster's hard to drop, but not 100% restartable.