I used to us the Ultimate Belt a couple years ago, it was ok. I then switched to the Flex Belt which was also ok. The gray Flex Belt is not as stretchy as the white one (which nearly everyone here uses), and broke the first time I stretched it out.

I had a tailored shirt as well and I was using the flex belt to keep my shirt stretched at all times, with no creases or folds. After a couple months of that I decided I didn't like the look and have forgone the belt. I just tuck my jersey into my compression shorts and let it stretch out a bit. My pants don't ride down as much, I get those tailored as well and they sit nicely on my hips. YMMV.