I have a 1665 I bought from Trevor a month ago. I took the whole thing apart after receiving it, just to make sure that everything was up to part. Love the 2836-2 movement in it. The HEV is definitely just like the gen one(from the information I have seen, read and pictures on the web) The o-ring was dry, so I lubed it and ensured that the spring/tensioner was bent correctly and tight. The crystal was just pressure fitted and had no gasket or o-ring. I GS glued it to the case, then ensured that the locking ring fit tight. The crown tubes were greased properly, as well as the case-back. Thus far, I can shower with it, wash the car, brush it after re-polishing the case and no issues with water seepage. I froze the watch in a 24oz beer flute filled with water. No damage.
I won't take it surfing, but I would love to spearfish with it before summer ends to see how it holds. I have not changed the crystal on it yet, as this one seems very close to the gen article and looks good.
Just my input and observation.
E