I've flown this a couple of times now, and it's quite nice in the air. Once you get the gear up, that is! I haven't stuck 4s in there yet, but I think it'd be a little overpowered. Besides, I think I may have bent the shaft slightly on my last landing... It's hard to tell which grass is OK and which is not at the field I flew at; some is spongy and green, some is (at the moment) brown and tufty, and some is green and smooth. I found some of the spongy stuff, and the plane stopped quite quickly (tipped onto its nose in spite of the flaps and flare). Should have landed gear up...
This is a wonderful looking Spitfire in the air. It's got a whistle to it as well, probably from the screw holes in the spinner. I find I don't get any more speed once I hit about 2/3 throttle, but that's OK. Unlike the MicroAces warbirds, there's been a lot of work getting this to fly nicely. It doesn't tip much at all, and doesn't even drop height in turns. Rudder is optional too. The roll rate is nice and scale. It's a little twitchier than I'm used to after flying a lot of FPV models, but it's really not bad once you get used to it.
I was well informed of the gap in the foam around the landing gear being an issue, so I filled it with hot glue and it seems to be quite strong. Other than that, I've needed very little in the way of mods and the build is literally about 10 minutes. It'll take you longer to program the sucker into your radio! For ~$120 bucks in the Australian Hobbyking warehouse, you won't get a better value warbird ANYWHERE.