I sell PSE TAC crossbows
right here at the LRH Gear Shop. The difference aside from 50 FPS less in velocity, is that the TAC 10 is a little shorter. This results from the designed shorter power stroke (distance that the string and arrow travels). I don't have the specs in front of me, but isn't the length difference only about 3 inches?
I have not shot a 10. But it would have to have the same accuracy, although at longer ranges, the lower velocity would result in a little bit more wind drift.
I have hunted out of a tree stand with armrest with my TAC 15i. Leaning on the armrest, I can hold out to 100 yards pretty easily.