My $.02
I haven't to date been able to get what I consider good tone going through my bass POD (note, not an XT).
My disclaimer is that there is a lot of tweakability with the POD and I by no means have exhausted all its possibilities. My time recording is usually relegated to very, very narrow windows of opportunity. I am also forever learning, so maybe it's "user error."
However, I'm now aiming to refine my tone using a) a bass I think can give me the tone I want, b) informed EQ, c) compression, and d) maybe a pre-amp known for getting what I want (Sansamp).
I haven't given up on the POD, but I know at least it requires more intervention from me than I've given it.
Finally, I sense that others think the POD XT is indeed quite well suited for recording, saying that they'll see then in pro studios.
HooBass