The issue with zipper placement would potentially be interfering with my BCD straps and/or digging into me, but I'd have to try one on before I can make that determination. That goes for any suit.
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I had the same concern before laying my cash down for the suit. I dive a BP/W with a simple hogarthian harness....I was concerned that the shoulder straps and the drysuit zipper would interfere with each other and be problematic. I have not experienced any issues with that what soever. I have no problems diving with my arms out front of me. I dive a singe tank so reaching behind and turning on/off valves is not a frequent issue but I have done it just to see if it would be an issue with my suit.
I am not a rep of aqualung or whites, and really don't care what gear anyone chooses to spend their money on and use. I am just trying to provide a counter-balance to some the advice and feedback that some have offered.
To me the biggest advantages, TO ME, of the Fusion suit are as follows:
1. it met all the basic criteria I was looking for in dry suit - trilaminate type fabric, front entry, field replaceable neck and wrist seals.
2. The suit design is such that if I gain a little weight or lose a bit it will not cause me to need to invest in another suit. The same applies to the fact that I can readily vary the thickness of my undergarments without having an adverse affect on fit...the only thing that shifts is the amount of lead I need to wear.
3. The fusion suit I bought has the air-core fabric which is a waterproof breathable laminate. I have found this to be very comfortable when suiting up on the warm Belgian summer weekends while I wait for my partners to finish getting ready to splash. While I have only been diving dry since the beginning of June, I am no stranger to dry suits as I have plenty of dry gear for white water kayaking. When I started kayaking my dry top and pants were not breathable; I quickly learned that w s a poor investment and replaced them with similar products made from gortex fabric, eventually I bought a full goretex white water kayaking drysuit....what I am getting at is that the breathability really does make a difference and I am happy to have this feature in my scuba drysuit.
I almost pulled the trigger on a 4th element suit from a great shop in the netherlands who seemed to be reps/ambassadors for the brand. The shop owner was really cool and spent some time with me to explain why these suits are so good. It was the same price to buy one off the rack as it would have been to have one custom made and I would have driven the nearly 3 hours to purchase one from them without any issues, except I started thinking about how much I was investing and that I did not want nor did my wife expect that I would need to buy another suit in the near future. The major thought of what would I do if I gained or lost weight? What if the cut of the suit felt good in the shop in the spring/summer but come winter when you are not dying to get out of those thick undersuits that you are trying the suit on in the shop with, that the suit just doesn't feel right? 2200-2400 Euros for a custom 4th element suit seemed less attractive given these practical concerns. That is what led me to the aqualung fusion. One of the things I like about it is that the neoprene outer skin layer compresses the suit a bit making it very easy to manage the air bubble inside, I can feel the air bubble move across my shoulders or up/down my legs depending on body position. My dive partners that use other brands (bare, dui, typhoon, etc) were surprise at this description of the sensation of the air bubble because in their suits the air bubble shoots around, as they describe it, based on their body position.
Good luck in your search, and I hope you find the suit that is right for you (your needs, your budget, etc.).
Cheers,
-Z