The only thing I did't like (when I was shopping) about the 100 mph suits, is that the 'bib' had no zipper. Not sure if that it still the design or not, but that was a big drawback for me. That, and I really couldn't find one that fit well. Haven't checked on the Pro-Qualifer version.
I've fished in a steady rain (sometimes a downpour) in my Guidewear while the temp never got above 43 degrees one February. Was dry as can be, other than feet got cold after that long.
Try and find (if you live close to both BPS and a Cabelas) the best 'fit' for your body style. Be sure to sit; kneel; squat; bend over; etc - before buying. Some folks like one style/brand, and others like the other.
Tex