Being able to do serious trails really depends on the driver. I have taken my X places that other guys in Jeeps haven't been able to go.
I now own a lifted Rubicon. There is no way that the most modded X could take the same lines I can on a hard trail. Can they make it up the trail? Probably. There is no way they would be able to take the same lines I can in the Jeep. The X just has it's limitations. (as with any other vehicle)
We ran John Bull last weekend (Big Bear, CA) The X's made it down the trail. They had a lot of problems on obstacles that I just walked right up.
I am not bashing the X. I loved mine and will always be a BIG supporter of them. I am just saying.
Jason
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So that one may walk in peace.....