Don't be too concerned about the negative comments. There will ALWAYS be some, often from just a few people, often quite vocal ones. Comes with the human race.
The critics may of course make some good points, so it is worth noting what they say. Some of the points will be for real, but others will be 'perception' which may be factually wrong. Sorting the two out can be hard.
There seems to be a lot of myth and fable around about Tyvek - and about silnylon. Both materials have changed in quality and construction over the years - not always for the better. Richard N has posted some interesting test results which conflict a bit with popular belief, but whether hard facts will matter ... who knows. I DO know that the specs for the Westmark silnylon have gone down over time - sadly.
Yeah, we all pursue gear dreams, usually at 0$/hr ... :-) But what else can you do?
"Damn the torpedoes, full speed ahead!"
Admiral David Farragut during the Battle of Mobile Bay