From what I see, I think parts for the Xray are expensive, however from what read they are a good strong buggy. I had an MP9 and a lot of the racer had the MP9 at my local track (here in Japan) but we switched to the Mugen MBX-6 as we found it a pain to setup at times and the Mugens were doing it very easy. I now have a Mugen and a Losi and enjoy them both. But different people like different buggies, so really it's down to personal preference, how much you want to spend and how easy it to come by parts.
Good luck!