A little feedback on the D1...I dove Wreck Alley in San Diego this weekend with the suit. I wore the bodyzor undergarment with it which is similar to long underwear. I'd highly recommend wearing something under this suit since the spring liner is a bit abrasive against bare skin. The suit is very warm and the included 5mm hood is nice. A couple things I did note however:
The hood needs a larger escape hole on top. I went ahead and fixed this with a pair of wire cutters while on the boat and didn't have a problem with it filling up on subsequent dive.
The exhaust valve doesn't vent fast enough. While descending at depth with little to no air in the suit, the spring liner does a great job at preventing suit squeeze; however, venting the air with this liner seemed to be a bit of an issue. When I got home I removed the inner spring liner and donned the suit with my bodyzor undergarment. This made the suit easier to get on, lighter (note: suit is very heavy with the inner spring liner in place) and allowed for greater mobility. I filled the suit with air while in garage and after playing with the si-tech valve, I was able to get the suit to vent much easier. At this point I'm not sure if the inner spring liner was preventing the suit's ability to vent air efficiently or if I needed to play with the spring on the valve a bit more to loosen it up. I'm also curious if the inner liner needs to be sandwiched a little differently near the valve.
For now, I'm going to dive the suit without the inner spring liner and see how the valve vents. If suit provides ample warmth with just this level of undergarment, then I will probably hold off on further use of the inner spring liner. If not, I'm going to consider trimming the inner spring liner a bit to allow the valve to vent better.
The suit is very warm, built very well and drew a fair amount of attention on the dive boat. The silicone seals didn't leak at all and once trimmed, were easy to get on and off. I did remove the external wrist attachments as I felt they were too restrictive and not necessary for my diving climate (So Cal). The pockets are huge, and even bigger when the bellows are unzipped. The boots are flexible and stout on the sole. The neck seal is an easy replacement; however, the hard ring provides a bit of restrictiveness in the neck similar to a horse collar kind of feeling.
I'll post back after the next dive sans inner spring liner and see how warm the suit is and the efficiency of the exhaust valve.