i purchased a 7.5fx as a commuter bike back in April- the third bike in my stable. I've put 400 miles on it in the last month and so far i'm impressed. i've not had any wheel issues-perhaps because i weigh 170 and am over 6 feet. i'm also not hauling tons of gear either.

the bike handles well, the tires are bulletproof and it's pretty fast when compared to the mountain bike i had been using for my commute (i've been able to shave 20 minutes off my commute)
the drivetrain is buttery smooth-and the triple allows for great climbing on the 10 large hills i ride over coming into work. i say go with the trek-