Hi. I'm a new member to the forum, but have been reading posts for the last few weeks. I am just getting back into bikes after a long period with a cheapie Mongoose that I used in college to ride from class to class. I bought a new '05 Cannondale F400 about three weeks ago and have loved every minute of riding on it. I wanted to ask if this bike is built well enough to actually use on trails. It seems like it to me, but you guys are much more experienced and I thought I'd ask your opinion. Can anyone let me know of their opinion on this bike and and of any advisable upgrades? It's got the headshok which seems pretty cool so far -- when I'm climbing, it's nice to lock it out so I'm not bouncing up and down wasting energy. I live in Chicago and it's pretty flat here and there aren't that many trails around, but I'd like to take it off-road. Thanks for your advice, guys.