Most of our groomsmen were fine with standard sizes. The only big issue was with the best man's tux which apparently had to be massively altered because he has an oddly shaped upper half. This cost him an arm and a leg! His tux was almost double the cost of the other guys tuxes.
We had a really great experience with President. They were very helpful and friendly. The only complaint I have is that they didn't seem to be very receptive to complaints from our bridal party about the size of the shirts. The tuxedos fit all of our guys perfectly, but 2 of the 4 groomsmen had shirt sleeves that were 3 or 4 inches past their fingertips! When they picked up the tuxes, they tried them on and asked for smaller shirts but were denied because "you can just roll up the sleeves". We ended up using safety pins to make them shorter so you couldn't see they were rolled. But overall in the end, the wedding party looked fabulous. The colors matched the bridesmaids perfectly! They were a great looking bunch.