I had an old hydro 27, it was the smaller barrel 4 blade that I ran on several different boats. It was always my favorite prop on my Allisons and Bullets. I sold it when I went to a saltwater boat. It was the best driving prop I ever ran and the only prop that ran faster on my 20' set ups was a Merc ET.
A friend of mine that has slung more blades than any person I've ever met, no exaggeration, still says hydros are the way to go.