Im a new diver with only about 130 easy Caribbean dives under my belt, plus a few drysuit and Catalina dives. So upfront I admit my experience in no way compares to every other poster on this board. Im in decent shape from routine swimming, biking and running. Im 48, 6-1, about 175 lbs, for reference.
I dove my first 100 dives with Mares Plana Avanti (pre-Quattro) fins. Before a June 2007 trip to Bonaire I purchased some Apollo XT fins. Why those? They fit extremely well. I would not have purchased new fins if my newly certified daughter had not taken mine. (Kids!)
I immediately liked my XT fins. I had early on started frog kicking, though I didnt know it was called that, for most of my diving and was immediately able to do so with the XTs. Ive since read that I should not have been able to. Since I dont get to dive much, being able to change equipment without frustration, effort and wasted vacation time was a big plus for me.
I have also since read the Apollo fins are no good for snorkeling, but they worked perfectly for me. I usually substitute hard workout snorkels for my routine swim workouts while on vacation, and was really impressed at my speed and how easy the XT fins were.
I had previously tried backing up, and though Im terrible at it (tend to ascend) I was at least no worse with the XT fins. (Funny though that I can back up easily with either fin while snorkeling. Go figure.) Do want to try some Jets, I admit, after reading what others say. Heck, Id find it fun to try all of them!
While diving Karpata my 5 8 daughter grabbed my slate and wrote, stomach upset. I signaled for us to ascend to 15 feet at which time I asked, Vomit? and she replied no. Staying at 15 feet I took her left hand in my right and with her simply dragging I towed her back to our entrance point fast. I was really giving it my sprint-to-the-finish effort. Even towing, it was the fastest I have ever moved under water. It made my regulator hose flutter violently; wanting to pull the regulator from my mouth, if that means anything. My daughter commented later about how fast we moved. (After she exited and stood up she immediately felt fine, so I think just a case of too much breakfast.)
Only negative I can think of is that they made my feet feel a bit heavier. When looking at blennies with head down and fins up and not kicking (trying to hold still), I noticed my feet wanted to sink a bit more than before. Anyway, just wanted to add my newbie experience with XT fins. Hope you dont mind the long post.