I had the Mission drysuit with the eVent fabric. I would not recommend it at all.
I noticed that the first couple times in class 3 water and no swims that it would sort of keep me dry, but no at all like it should. After a 3 or 4 times wearing it, and still no swims, I noticed that I was getting drenched. I could actually feel the water coming into the suit if I got hit in the chest by a wave. I sent the suit back to NRS, and after dealing with some customer service issues (they said they didn't have one in stock, so I would have to wait a month for them to replace it), I got a brand new suit. This suit had the same issue as the first. I called up NRS and asked for my money back...I went and got a Kokatat GMER....which is awesome and slightly more expensive.
I would go witih a Kokatat over a NRS.
Also, check out the Palm Stikine...It is slightly more rugged fabric than the Kokatat or NRS, but you sacrifice some of the breathibility compared to the Kokatat. The main difference is that the Palm's have the zipper on your back instead of the front, so it depends which is more comfortable for you. I think the Palm Stikine costs about the same as the NRS Mission.