I haven't used them, but if there's not a person behind it making the arsenals, then in seems impersonal and simply a filter for what someone thinks would work. Like the ball selectors on various manufacturer's websites (Track, Storm, Columbia), very limited in what they can suggest or provide.
Given the staggering wealth of knowledge available here and for free from real pro shops and drillers (and, in the Brunswick case, real ball reps), I can't see why someone would pay an anonymous website to suggest balls.
Like pr0n, given the great free stuff on the Internet, why pay for it?
SH