The original ECWCS pants and parka are both great, just heavy and bulky. They're not very breathable, either. They do maintain waterproofness for a long time, but it will have to be renewed at some point, like any other Gore-Tex.
What I like best about them is they're tough. We got to field test the original ECWCS gear about 19 years ago, before it became standard issue.
Until a few years ago, I had another set that I used outdoors, and as a rainsuit while working construction, and later in very rough industrial settings.
Wore them for years in a place where we treat the "heavy duty" PVC stuff as disposable, as we ruin them in a couple of uses. Used to have someone wash me off with a firehose after crawling around inside equipment we had to clean out, and getting covered in gunk. Finally tossed them, not knowing you could retreat Gore-Tex at the time, as the parka began to soak through, and later the pants, which had tar and other crap that wouldn't come off, and had gotten sulfuric acid on them.
Really solidly constructed. The pants had one small tear near the ankle from sharp metal.
This is not my choice to carry for "possible" use in the woods, but is great for a primary piece of outer wear.
I'd like to get another set for work(and anything that'll get me to deviate from my "no camo, no velcro" rule is good stuff!), but you better be a woman or a real little fella if you want one of those $39 parkas linked to!
