I have to confess, I jumped on a 2011 paragon (29er hard tail), I've been on a 29er full suspension ever since 2003 when I got a Sugar 293, that's the bike I cut my teeth on and started honing the skills. Then got back into racing as an adult (having raced in the 90s as a teenager) and got myself a 2008 HiFi delux which I still have.
The 2011 paragon is 2.5cm shorter than my 08 HiFi delux, noticeably lighter (not sure how much), a little bit nimbler, and the 10 speed over the 9 speed is INSANE what I can do in middle chain ring. Quite a bit of performance gain with the new bike, but at a cost! I cant speed over the trails paved with fist sized rocks as well with the hard tail. There is a trail close to me that I have loved to ride since 03 that is just painful on a hard tail! But when I slow down and rock craw the more technical and difficult trails, there is little downside with the hard tail. The gearing range make it much more suited to the amount of torque and speed I like to use in the very technical rock garden. Also note, there is one rock garden with tight turns and LARGE obstacles to ride over where I tested the paragon, no one I know with who rides a 26'' wheel has ever made it through...I however, made it on my first try with the paragon.
There are race venues in Texas I could waist the night away describing, but in short, 90% of them I could or would take a hard tail 29er on, as they are smooth enough for it. Racers don't like the rock gardens, they are usually left out of the race corse...
I could have started my own thread about the bike, but I felt it was more pertinent to this debate then to just show off my new toy...
Allow me to sum up all that blaw blaw I just typed...
26 hard tail/soft tail: No good
29er hard tail: Good
29er soft tail: Better, if you go Crazy Places at high speeds...yes Crazy is capitalized.