I have one (Tech" not "Bullet" version although I am looking for a Bullet skin to have the option) and happen to like it.
Although I'm still quite new to drysuit diving, I really appreciate that the skin keeps it dynamically conforming regardless of undergarments or position and the fact that my top half is typically a size larger than my bottom half. Other's (calling
@Marie13 ) find the zipper construction/placement and the replaceable-seal neck ring to be detrimental to her comfort and flexibility and she just took delivery of a more standard DUI trilam suit.
@Zef has written quite a bit about his - mostly complementary. If you search on "Fusion" and their screen names, you will find much more detail.
In the end, you'll really need to try it on at minimum, with a full rig-on if possible, and better yet a try-dive or pool-session to really start to get a feel for it. I went in educated but unable to even try one, and got lucky that it seems to work well for me.
The SiTech Oval replaceable wrist-seal rings allow you to use several different Dry-glove systems. I very happily use the Waterproof Ultima rings with Showa 720 gloves which seem to be the ScubaBoard favorite, but the new Rolock90 ring system is getting a lot of favorable reviews. With just the Showa 720s and a
very thin merino liner, I'm quite comfortable in the low 50s. Dry hands are so much more comfortable.
Mine is one of the new generation "AirCore" versions and I got one of the defective ones that came from a problematic switch to a production facility in Mexico. Mine had the worst leakage that I heard of and I was soaked and pouring pints of water out after a dive. Aqua Lung moved the production back to the Whites (originator of the Fusion) facility in Canada and replaced the core under warranty. The new one has been fine. My suggestion is to be absolutely certain that you are getting a Canadian-made
core if you are buying an AirCore (newer) version - note: the tagging can be very confusing.
If you have any other specific questions, ask away.
Do you happen to dive with the NYC Sea Gypsies? If so, maybe I'll see you on one of the trips next year.