I'm a Fusion fan- dive my drysuit about 25-30 times a year- so not a heavy drysuit user. I will probably greatly increase that number next year when I move north. My issue is wide shoulders, very long torso, very short legs, and very short arms- quite the mental picture
, heh. I have a Diving Concepts (crushed neoprene) that I bought used, dove for a little while, but just too tight in the shoulders- had issues reaching the values.
Have tried a number of dives in multiple DUI and Seasoft suits, and the only course of action for me was a custom suit, which tallied into a lot of dollars for a limited number of dives per year. Enter the Fusion... while it is closer to a trash bag covered in stretchy neoprene, I can finally easily reach valves, put on my fins, and put it on myself without any problems. I even don't find it that difficult to put on after the first few dives. In my area, I was able to get the Fusion Tech, replacement neck seals with silicone, for about half of what a DUI custom would cost (I do use DUI Rock boots). OTOH, I thoroughly agree that the Fusion is NOT for everyone. If I didn't have the Fusion option, or dove a drysuit many times a week, I would probably go with the custom DUI.
The big thing for me was I was able to drop 6 pounds of lead over the other suits I have tried or owned- I use less with MK2 underwear than I do with my 7 mil fully body wetsuit. And with a bad back, that is most important.
My biggest complaint is the bag- excellent functional design with shoulder straps, but the main compartment zipper sucks! After several uses with a gentle hand, both my first bag and a replacement one have lost zipper teeth- the zipper is really cheap.