The Good: Descends like a bigger bike than it is, durable, excellent frame stiffness
The Bad: A bit heavier than some similar carbon options
I've had my 2013 Spitfire for about 16 months now during which time it has been my primary bike for all sorts of riding. It is still going strong and remains my favorite bike ever. I had a V1 spitfire and experienced the known bushing issues (although that was also a really fun bike). Banshee took care of me with a heavily discounted V2 frame which has more than addressed shortcomings with the prior frame. It had been ridden in a wide variety of conditions from my mellow non-mountainous local trails in NC to our jump trails to the roughest stuff in the mountains of western NC. Essentially, I agree with the other reviews with a few exceptions you'll see below. The bottom line is that if you want a bike that will get you up the hill efficiently and with enough energy to really get after it on the way down, the spitfire is a great choice. If you're in the market for a "play bike", think about the spitfire. I think the spitfire is somewhat unique in that it sports a little less travel than most of its direct competition (SC Nomad, Spec Enduro, Giant Reign, etc). I personally feel like this allows the bike to ride less demanding terrain without feeling like way too much bike while its outstanding geometry and suspension design allow it to retain the ability to push hard on more demanding trails.
The longer review below mentions the rear end being overwhelmed in more "DH" type situations with the stock Fox CTD shock and I'd tend to agree here. I will, however, add that when I upgraded to a Cane Creek Double Barrel air, there was a night and day difference and with a Pike up front, the bike really is extremely capable in essentially any terrain. Obviously there are limits to what a 140mm travel bike will do, and it's not going to ride like a real DH bike. But the spitfire really does punch above its weight in terms of handling terrain and speed that would cause many 140mm bikes to flounder.
I have no intentions of "upgrading" my frame until the next major Spitfire revision. Can't wait to see what happens next.