I got my 2007 fx disc this spring and have put 3300 miles on it.
Quite a few of my miles are pulling a trailer.
I would immediately switch the stock racing style tires out for something that works for commuting. My bike shop gave me 50% of retail value on trading in the parts that came with the bike so I traded in the saddle, handlebars, pedals and tires and replaced them with stuff that is more functional.
I have put thousands of miles on disc brakes and they are 1000% better than rim brakes. Some of my hard core commuting buddies go through several wheels per year due to rim failure/wearing out and disc brakes are nearly maintance free whereas rim brakes are in almost constant need of adjustment, pad replacement, digging crap out of the pad etc.
Here is a pic of my 7.3 in action. BTW even though I often pull 100's pounds of crap my back wheel still spins smooth and I have only broken 1 spoke. I dont usually pull a load this heavy but I pull 100#'s or so almost everyday.
Also, I did not get the 7.5 because I did not think the carbon stays would hold up as well.
