Well, here's what I can say. I don't have anything to compare it to, so if it preforms better/worse than something else, I don't know.
I have not stalled the tractor at all.
I do know that in 2nd, with a box full of dirt, in 2WD I stopped the tractor (not stalling). Dropped it in 4WD and took right back off. In knocking down trees (probably 6"-8" in diameter) with the FEL, I was able to move the FEL without any noticeable loss of power (to the FEL or steering) while driving. I believe, that this has a lot to do with the dual pumps though? One pump for the steering and the other for the FEL/rear remotes.
Does that answer your questions?
In my short 6 hours of use it seems to be quite capable for what I want so far.