I have a 2008 4X RC3 on my DJ, I weigh 200 lbs. and do dirt jump, street and park with it. I have never topped mine out. The fork feels amazingly light up front and haven't had a problem yet. I also have several friends that run 4X and no problems there either. 4X all the way.
yeh but there more versatile, because you can do DJ, street, and a bit of freeride on them, aswell as most other types of riding.
That has more to do with fork settings than the actual fork. I use a 4X for everything and it works well for DJ, street, and park because it is set up properly. I don't freeride, but if I did, I wouldn't be worried about using the 4X.