I no longer dive with a Fusion, but I do have a history.
1. My original Fusion was from when they were first invented. They came with boats specially designed for them. They put my feet into the ScubaPro no man's land of Jet Fin fitting, so I had to get Turtles (before they were sold to XS). The boots sucked. When the lacing broke and I asked Whites how to repair them, they said, well, um, they can't be fixed. If the laces are broken, you have to throw the boot out. (I'm serious.)
2. Whites did away with that boot model and gave me a free pair of their upgraded big, heavy, clunky boot. The good news is they fit my Turtles. The bad news is they were big, heavy, and clunky. I hated them. I hated the way my feet felt when kicking.
3. After that I went to a pair of Converse All Stars. My Turtles no longer fit, but I could now fit (barely) into XL Jet Fins. (I eventually went through several procedures to try to stretch out the foot pocket so they could fit a human foot-I have no idea what species they were designed for.) I of course had to buy them oversized to make room for all the socks (etc.), but I guessed wrong on that size, and after a while I started to have pain in my feet because of the compression. It turned out I have
Morton's Neuroma in my right foot, and I need a spacious shoe fit. The tight fit in the Jet Fins was not helping.
4. I bought a nice roomy pair of wet boots and sold the Jet Fins. I used them for a while, but I was not happy. The zippers kept coming open during the dive, and they wore out quickly where the fin fits across the instep. It was during this period of time that I switched to a different dry suit. I could have bought it with built in boots, but I was afraid to do it. I was buying from a dealer over the Internet, and I had no place to try it on first. I was very afraid those boots would be too tight for my foot, and I did not want to be in pain.
5. I bought another, roomier pair of Converse All-Stars, and that is what I am using now, with the wet boots still sitting in the dry suit bag in case I need them. They are OK, but I find them to be a PITA, to be honest. It takes a long time to get the shoes on and laced up, probably in part because I am too inflexible and should probably try to get back to my fighting weight.
In short, I have not been happy with any of my choices and would be glad to hear a good suggestion for something else.
BTW, I still have my original Fusion, size L/XL, with the Si-Tech Ring system, a Bullet skin, and a P-valve. I also still have the Turtles. If anyone is interested.....