I have bought and reloaded 155 gr XTP bullets when I can trade or get them at a reasonable price. I normally save them for the nickel plated brass and keep them in my long term stash.
I don't carry reloads but do keep a percentage of my reloads in reserve for the inevitable dry spells when things are scarce.
The XTP bullets shoot about as well as my Montana Gold bullets, and in a pinch, I would carry them if nothing else was available.
I've never bought factory loaded XTP ammunition, so no help there.
This data is a bit old, but the XTP has been around for a while, so I would assume the bullets will perform about the same as indicated in the charts:
http://www.firearmstacti.../ammo_data/40s&w.htm