I just used one on my last Nailbomb track in the players forum. There's a lot of debate on the Line6 forum about the 'fizziness' of a lot of the high gain amps and many people say the POD2.0 (not XT) is smoother and warmer so if you want a simple good recording unit that might be a good bet, but the flexibility of the XT range is great especially if you plan to hook it up to a computer and use the Line6 edit software.
As regards the fizziness, yeah it bothered me and I found it hard to get a good sound and spent ages tweaking, but when I downloaded other peoples patches it sounded great!
But note, Line6 doesn't work with new Intel Macs (like mine!) so if you have one be prepared to use a PC or older mac to use the editing software and you'll need a recording interface instead of using the USB.