Normand,
Played around with what was probably the precursor to that system back in the mid 90s. Worked fine...(only problem was that the 'markers' tended to dry out between uses unless you used them every day or two..hopefully they've fixed that)
Then I was given a 'real' dual action airbrush. Like that much better as far as results go. With a bit of practice you can do some amazing things with a good airbrush.
But I seldom use it anymore for most poppers...I can get a nice look with just regular 'permanent' markers and playng around with the finishes on foam...and the fish certainly don't seem to care.
When I do balsa, though, I do break out the airbrush...the wood baits seem more 'permanent' to me and thus more worthy of finer 'artwork'.
Buddy
It Just Doesn't Matter....