Well, I'm an old snorkeller who began in the late 1950s and I'm firmly in the "if it ain't broke, why fix it?" and "new doesn't mean better" camp. I still swim with the good old-fashioned kind of all-rubber full-foot fins popular half a century ago and having seen what new-fangled products fin manufacturers have come up with over the years to tempt underwater swimmers I remain happy with my original choice. There are still plenty of manufacturers making fins the way they used to be made and the way I still like them.
You say that your TUSA fins "still do the job". Why not stick with what you know? If your original fins are still in production, you could simply get another or similar pair. Whatever you do, don't give into peer pressure and buy something new and untried just because it's "flavour of the month". Fins are very personal items of gear and should match each individual's foot dimensions, intended activities and swimming style, nobody else's.
