I've been paddling the fluid solo for several years now and I have to say it's probably the only creek boat I will ever use. The durability, boofablitity, and maneuverability, have made it an ideal boat for paddling colorado class 5 mank every day after work and on the weekends.
The downside to this boat is the weight. I like to think of it like this: the solo generally does weigh more than your average creekboat, so it can be a pain while hiking and portaging, BUT - if you are a decent paddler and you want a boat that has bomber plastic, a long life, and an unmatched warranty - it's worth carrying the extra couple pounds around.
As previously mentioned, the outfitting is being upgraded in 2010, but the current outfitting is still good to go. I've broken several of those "hip wedges" that hold the seat to the shell, but Gavin has been really good about sending me new ones whenever I've needed them.
You can not beat the fluid customer service. I work in a kayak shop and have dealt with people from every company in the industry and no other company has been as impresive as Fluid.
As for the question about volume, I think that the large solo has the perfect amount of volume (@ 75lbs). It is a little less than the industry standard, but the way the rocker is designed allows for less volume, which increases maneuverablity. I think the whole "big boy creek boat" fad is going to die out soon and people will start paddling boats that are designed to fit them better instead of boats that are massive enough to punch any hole.
All in all, just try it out. It sounds like Dan is willing to hook anyone up with a demo near denver - definitely take him up on that if you can.
I hope some of this info helps. I'll see ya on the water.