Don't have the XL. Have the 3000, but love this program. I use it almost everyday. You should really download the demo and check it out. If it doesn't work for ya, you'll know very quckly. I wouldn't take somebody else's word for it....especially while the demo is free.
The major question is whether you are OSX or OS9. There were some problems, but a lot have been ironed out.
and another question: when i record a sample (.WAV) on my zip (with peak), when i load the file in the MPC there is a lot of files with the same name but funny signs ...
there is a way to make hidden files viewable in osx. i have forgotten exactly how. but there is a program for x called tinker tool. it is available on downloads.com and is free. its has the same feature.