well .. they had the mosquito and the knowledge that lead them there - if you check a mosquito, then the pro and then the pro KS you'll see...
i think the stamos was not too hard to develop for it is just a low power version
but the booster had to be a hard one - no one tried this before and some ideas were quite good...
but if you check the release dates ....
these guys were even worser than naish!
from the moment iv'e heard of the booster, it took ages until they announced a release date and from the release date it took ages again, till the boosters were really availlable. . .
i think this was, too, one of the facts that this kite didn't sell too well.
i suppose that the booster 8.6 is a cool kite.
but, on the other hand, nearly all kites in this size are great (naish ar5 & arx & x2, north rhino, takoon, slinger, etc etc)