I also acquired a Fusion suit lately. After using it for some dives, I'd say it generally does NOT do what it advertise, or least does NOT meet my expectation.
First, getting in and out is a hassle compare to a shell suit. I have won TLS and CF, both are much easier in and out. Now someone mentioned Fusion is still easier than a 7mm wetsuit. This I am more or less agree. Yes, Fusion is easier, but not by much.
Then, the advertised to be a very mobile and flexible suit, this I totally disagree. Even with just a thin fleece under shirt + 200g thinsulate, I feel the Tech skin is too tight. I can't move my arm like I can in my shell suit. Yes, I think I can do splits like it is advertised, but split is NOT what divers do underwater. Reaching valves is. I have to struggle to get to my valve. This is my most disappointment. Totally not how I expect this suit to be. I am hoping this is a tech skin issue. I will try sport skin to see if I am not mobile.
I can see this is a more flexible suit when I have minimal undergarment or just t-shirt. So it could be good tropical destination suit. But being in NorCal, I need that 200g if not 400g thinsulate.
So as advertised to be a good travel suit, I also disagree. First, the Fusion Tech skin with integreated boots is heavier than my TLS350 with turbo suit. It does fold down smaller tho. Second, Tech skin and the boots take a few days to dry. If I were to take this suit a live aboard, it will still be wet when I am flying home.
On to the good side. So far, this suit is easy in water. Bubble management is very simple. It can make a bad drysuit diver look good.
Overall, I am not impressed so far, and not recommended if you dive in cold water. I will try out sport skin later. I hope my impression will change.