It's easy to modify that Xport rack from Performance to take a longer bike. I've done it with mine. For an inexpensive rack, I think it's a good one.
That being said, when I finally stopped buying bikes long enough to afford a nicer rack, I bought a Sportworks rack which I think is one of the finest ever made (Sportworks' non-bus rack division got bought out by Thule, who promptly replaced the Sportworks racks with something cheaper, but which is still a nice rack). After buying the Sportworks rack for my truck, it took me over a year to finally find one of the rare 1 1/4" Sportworks racks for Rose's car (my truck takes a 2"), but I finally did, so I can use all of the Sportworks individual modules on both our vehicles now.
If you really haul your bike a lot of miles on a rack, I think it's best to save your pennies until you can buy one of the really sturdy racks. The Xport doesn't fall into that category. I'm still keeping my Xport rack, though. It never hurts to have an extra, and it's quicker to adjust it for someone else's bike than my Sportworks.
For long bikes, it's really hard to beat the
DraftMaster racks. If it was mostly my Stratus XP that I hauled, that's what I would own.