I've said it here many times before, but I love my Spitfire. I've had it since November and done little to change my original build of 650b Pikes and CCDBA CS with 26" wheels. If you look at previous threads I've put more detail into my build. I got a great deal at the time by pre-ordering through Blazing Bikes near Church Stretton in Shropshire. They were very helpful and did a frame and forks deal for a smidge over £2k. I guess with everything new my build would come in a little over £3k but I used a number of bits from my old bike.
I've not had any major problems over the summer and I've been riding 2-3 times a week, everything from forest bimbles to full on Ffestiniog downhill. The suspension pivots sometimes work a bit loose and you really need to protect parts of the frame near the chain. Even with a clutch mech and a single ring I found I was getting a lot of clatter on the rough stuff. I does like to collect the dirt as well in all those tight spots. I have never tried to fit a front mech, or a chain device but it's pretty tight around there so could imagine it being a bit of a pain. That really is all I can think of that's negative.
The suspension works so well for me. On the CCDB with 15mm (25%) sag and the small volume spacer, I have reduced the HSC by a half a turn and added a turn of HSR. I found it was bucking me a little with the base tune (I guess some like that pop ). Now it's working great. The Pike I have set with one token and 25% sag, a couple of clicks of compression and the rebound somewhere in the middle.
I have a hope headset that was driving me nuts a week ago with a click whenever I compressed the front end. A nice chap in a LBS suggested that I position the crown race with the slot facing sideways. Well I did this and tightened all back up and all is now silent... result!
Last weekend I rode Penmachno. It was wet and windy but just the perfect trail for the Spitfire. It peddled well and descended even better, proper smile inducing fun! Interestingly there was another chap there with a Rune. Only the second time I've seen someone else in the wild riding a Banshee...