My foes FXR is a great bike. As other's have hinted, the bike is much stiffer than just about anything else in the same catagory. The heckler is kind of like the budget buy, but if you got the cash the FXR is a great bike and worth the price. Everything about it is designed to be stiffer than it's competitors. Notice that the seatstays and chainstays are much shorter than the heclkers, they are still a good diamter though, the pivot is huge, it uses a swing link to stiffen things even further, asymetrical CNC chainstay yoke, CNCed main pivot/BB shell, 68mm BB, etc. It's designed to be stiff in as many ways as possible. This makes the FXR a very sharp handling bike, even though it has laid back "trailriding" angles, it can change lines very fast and simply handles like a dream.
The geometry of the FXR is nearly identical to that of the turner 5 spot, except that the FXR has a bit slacker headtube. The low BB of the FXR gives it stability, while the short chainstays give it great handling. Effective top tube length is great, but hard to visualize.
I ride the FXR most of the time, I really wouldn't trade it for anything right now. After you've ridden a foes for a little while, it's really hard to go back and ride anything else because of the stiffness. You just get used to how well the rear end tracks and how the bike feels like "one solid peice", and most manufacturers do not have a feel anywhere close to this.
The chapp is much heavier than any other bike in this catagory, the frame is 10.75lbs as weighed by go-ride.com. Those guys are usually pretty accurate and not out to fudge numbers for any reason (they are a banshee dealer after all). That will turn a 30lb trail bike into a nearly 33lb trail bike, which is a fairly significant amount, but to truly utilize the chapp frame, you'd want to build it up with somewhat stouter parts and components, other wise it's a bunch of fairly light parts hanging on a heavier and more capable frame.
The FXR frame is around 7-7.5lbs with an airshock, around 8.5-9lbs with the curnutt shock, around 8-8.5lbs with something like a fox DHX, which is what I recommend at this point. You can't get the DHX OEM on an FXR yet, but if you buy the bike with the vanilla RL or romic shock, you can bolt any fox right up to it without anything additional.
There isn't much I don't like about it, the front derailer cable routing is a little funky, the reason is that the front derailer is actually on the rear triangle, even though the rear triangle is not connected to the BB. It's just a litle odd. More seatpost adjustability would be nice, but there are some products out there that negate this (FSA makes one that isn't too expensive). More seatpost adjustability might lead me to use the bike out of its intended usage anyway.
I'm running a marzocchi all mountain 1 on mine, 5 to 6" of adjustable travel. It's a great setup.