While I don't have the LL Bean Helix waders I will state that many non-GoreTex waders are now in the $400 range. I have a pair of Redington CPX Zip (with the full length zipper) waders and they are $400 as well, but are not GoreTex. I've found them to be extremely breathable and durable. While I think GoreTex is still the gold standard for breathability I think there are a good number of similar products out there now at a lower price point that are equally as good. I have a Helly Hansen rain coat I bought 10 years ago (non GoreTex) and it is still going strong today.

Plus with the Bean guarantee if you aren't happy down the line they'll stand behind their product so you can't really go wrong.

Brian