klementine79, I've been using the X-Force Pro for a little over 6 months now and am extremely happy with my choice. I've been an avid Fischer user over the years, most recently using the M-Comp 95s, so this wasn't much of a stretch for me as most of these frames are essentially the 'Black Granite' versions of the Fischer line that never made it to the US.
First, if you've never used Fischer, most of their frames are low powered. For me, that is a good thing as I struggle with control often, and these frames seem geared towards people with fast swings.
Second, while this line is slightly stiffer than it's predecessor, they still retain that 'Fischer Feel' people always talk about, albeit a tad 'crisper'. The X-Force Pro has great plow through, is nimble around the net, and swings easy through serves. The frame has great touch as well.
I hesitate to mention 'access to spin' as to me that is dependent upon your strokes, string & tension. Having said that, I have no problems generating it, whether it be on serves, returns, topspin groundies or slice.
For the record, I string Gut mains @ 58 with Topspin Concept Pure crosses @ 56 on hard courts/indoors. For clay I move to Solinco Tour Bite 18g @ 56lbs (I break the Gut too quickly on clay).
I see that you are from the DC area, so if you've ever hit w/ auzzieism, then you've pretty much seen my game. We are very similar in all aspects, except he has more hair than I do...