Ed, I've thought about different ways of getting the seat angle more reclined without the tire interference. The stock seat mounting tube has about a 15° bend. I have an idea for a triple mounting setup with positions at 10°, 5° & 0°. I was also going to see if I could trick up a quick release, also. I don't know when I'll get to actually building it. Currently, I'm developing some prototypes of a rear disk brake mounting bracket for putting Avid disk brakes on the back of the Freerider/Sofrider/V2k frames.
Back to riding impressions: The Sofrider is very comfortable to ride, as is the Quest. The suspension travel on the front fork of the Sofrider is a bit more than on the Quest. The 26 x 1.5 Kenda Kwests are a pretty good tire for the Sofrider, but since they're heavier than the 26 x 1's fitted to the Quest, you can feel the difference in rotating mass when you try to accelerate. Also realize that the Sofrider will handle a much wider range of tires & wheels sizes than the Quest. With the Quest you are limited to 26 x 1.25 as a maximum. Nanda has built up some fairly wide tired 406 rims for one of his clients to tour on.
I'm currently building up a Freerider with some 700C x 28 Gatorskins, Vuelta XRP pro wheels & a 2 x 8 drivetrain. I'm anticipating a very quick ride. I've also got a version for a very overweight friend of mine with some 26 x 2.3 K-rads & a 3 x 9 drivetrain. If you convert the Sofrider to disk brakes, you can swap wheels with abandon, even putting the 406 rims on.
The steering feels a little bit quicker on the Quest, probably since the steering angle (unloaded) is about 72° compared to 68° on the Sofrider, in addition to the narrower tires. Although the Quest has steering with more "reach" than the Sofrider, they're both comfortable. However, I prefer the slightly stretched feel of the Quest. [When I did the Vendetta layback mods on the Quest, I reversed the steering stem 180° & lowered it 2". Then, I could comfortably reach the steering at the 29° seat angle. BTW, the aero advantages are very nice with this setup.]
The other thing I prefer about the Quest is the rear suspension; when stock it's a bit better at damping out the chip seal vibrations. To get a similar response on the Sofrider, I found I had to install an air shock & play with the spring rate.