Another Xtreme owner!

They're actually pretty cool little stoves. They're fairly powerful, although you have to be careful if you really open 'em up; all that power is not without cost. They'll eat fuel at a pretty good clip.
If I were going into truly harsh, cold conditions, I'd probably take an XGK, but if it's cold and I need to do real cooking (where I need a good simmering stove), the Xtreme is a good one, and as you said, it is a really easy stove to use.
Interestingly, Colin Fletcher spoke highly of the Xtreme in his Complete Walker IV.
HJ