I've never had a 400 but... the XX to me is a tad nose heavy, but rides wheelies pretty good. If you're worried about the bottom of it, PRM makes a full skid for $199. I'm probably bout to pick up one for mine. I rode this weekend behind a LTZ400 Suzuki and I was on his ass pretty good. As far as power and straightline a 400 doesn't hold a straw to one of these. The IRS makes it handle like a vette on dirt. I love it. Also, the ground clearance is AWESOME! about 11" of clearance! Same as a grizzly or something along those lines.