I can tell you that eVent is much more breathable and just as waterproof as Goretex. 

 

What I can't tell you is how durable the NRS Drysuit is since that depends on the quality of construction and the durabilty of the face fabric that the laminate (eVent) is bonded to.  Odds are that if you are happy with older NRS stuff you will be happy with this.  

 

Finally, IMHO beathability, while nice, has only a short term value for whitewater kayakers.  The primary reason is that once the DWR wears out and the face fabric wets out (i.e. the water soaks in rather than beading up) breathability drops significantly regardless of the laminate because that layer of water is now the limiting factor.  Because whitewater kayaking tends to break down DWR treatments after only a few times out the breathability of the laminate is only important for the first few uses.  Washing and drying most garments helps restore DWR treatments but the latex gaskets on drysuits preclude this. 

 

Basically, if you trust the quality of NRS products and the price is good go ahead and get the drysuit. 

 

eVent should be more breathable than Gore. Durability will depend on whatever outerlayer they laminate to the eVent. The waterproof layer itself should be similar in terms of durability. Historically, NRS has done pretty well with the durability of their drysuits. Also, their warranty program is solid. I think it will probably not be quite as nice as a Kokatat but still a worthy option. Is it cheaper?

 

The best thing about Gore-tex is that it is warrantied by both the product manufacturer and Gore. So if your suit fails and Kokatat won't fix it. Gore guarantees it for life so you can send it back to them. Most likely eVent won't have that type of warranty.

 

I still think the eVent is worth a shot. Way before Stohli, Palm and IR.