I finally figured out that this thread had been moved to the Plus Bikes forum. I'm just running 2.5 and 2.6 tires in mine, but whatever...
I took the Japhy to the local trail today for a gentle test ride on some easy trails. The bike fits me well, but it could stand a shorter stem than the 90 I had on hand. I think a 50 would work. The bike took the twisty turns stably with no hesitation to lean but stayed where I put it, not fighting to fall in or stand up. A shorter stem should make it just a bit quicker to turn which would be OK. No sign of any wobble from frame flex and no loss of traction, so I will be confident to throw it into the turns harder next time.
At the top of the first long, gentle climb, I stopped for a photo break and noticed a wretched odor. Seems I had run over some sort of wildlife excrement, so the nice, white frame got a good smearing on the seat tube at the chainstays and the seatstays. Gave it a good hosing and scrub with a rag when I got home.
This was my first time riding a MTB with a steepish seat tube angle and it did seem to be easier to spin while climbing and had good traction. It was a first ride and I took it easy, plus I'm pretty out of shape at moment, so I couldn't really have pushed the bike hard if I had wanted to, but my overall feelings about the bike so far are good. The personality is straight down the middle - not too aggressive, not too laid back. Just right.
112cockpit by
Benny Watson, on Flickr
112front by
Benny Watson, on Flickr
112poo by
Benny Watson, on Flickr
112twistystart by
Benny Watson, on Flickr
112woodsy by
Benny Watson, on Flickr