I'd like to think the same but the portals have been available on military recycler websites for about $180 ea for over a decade now and haven't caught on. Back in the day Stazworx was building solid portal axles using Humvee portal boxes. I think he only built one or two sets and then gave up on it because they didn't sell. I don't know if there's something wrong with them or what.
The helical geared ones are quieter and apparently just as strong as the straight cut ones. With Mog axles generally the straight cut ones were stronger because they didn't put a side load on the box, which was always the weak link. That's why the 404's are so famous for breaking when the 406's and bigger weren't. (404's were helical, 406 were straight.)
From this thread:
http://www.pirate4x4.com/forum/hummer/620537-hummer-portals.html
Here's a pic of a set of Stazworx axles using Humvee portals.