So as a person who swears by Bones wheels, I can honestly say that Spitfire F4 wheels are pretty damn amazing, but they don't last as long as bones do on shit surfaces, I've sold a few sets of F4's to have costumers come back requesting bones instead, one set of the 99a F4's started to bubble apart, i kinda put it down for being a dud set, but as time has gone one, as much as we sell them, the f4's get some weird reviews locally.
I think its just come down to personal preference, some people just don't like spitfire and some people simply don't like bones, obviously they're other wheels on the market, but in our stors, its STF vs F4 all the way...
I will say this, for guys who like bones but also like them to slide a bit more like spitfires, get coloured formula's, for some strange reason they seem to slide way better than the standard white. (would be curious to know if anyone agree's with me & could possibly explain why that is?)
Overall, F4's have saved spitfire from just being that wheel brand with the really known logo, to being a proper wheel company again!