I like the Turbo twist on my Freshwater tank. I have never had any problems with algae blooms, bacteria blooms, or most diseases since i put it on. It took loosing an entire tank of livestock to some 72 hour mystery disease to get me to pony up the money though.
As far as SW goes I think there are a lot of mixed feelings out there about them. They kill every living thing that goes through them, not just bad stuff. I am interested to hear some people with experience respond to this one. I'll tag along for the info.