Lots of info to be had at
www.4wdrc.com . Lots of guys on the forum to give you the straight deal.
I'm biased, but we think the X - 5 has the best balance, both fore & aft and side-to-side of any 4WD on the market. This makes it even easier to drive fast than the xx-4. The X - 5 is also probably the easiest to work on 4-wheeler out there.