I was in the LBS on Saturday getting new pedals (because my Fat AZZ broke one), and I took the Trek 7.3FX out for a long test ride. There is a huge difference in speed between the FX, and my MTB.
I road that thing like I stole it.....man was it fast compared to my MTB.
I also did ride the Trek 7500, and it was not to my liking.
I would recommend the 7500 to somebody an older, or to somebody with back problems.
I am 31, but my mind still thinks I am 18, and skinny, so the upright position was not for me.
So now my delima is what bike I buy the 7.3, or 7.5.
The 7.5 is about $200 more that the 7.3, but has much nicer components.
I honestly don't have the money for either, because I just bought my MTB, a new house, central air, and a LCD TV in the past 2 months.
I don't want to buy the 7.3, and then 2 weeks later wish I had the 7.5.
Anybody out there go through this same delima