I don't recall what fabric they were using in 2017. They tried a fabric for a while that was great for warm water, but it did have some pinhole leakage problems and in cold water it wouldn't be ideal. The goal was a fabric that let sweat out but didn't let water in, and that utopia is still a ways a way from us.
Plastic zippers are a love or hate deal. Some love them, some hate them. The people that destroy metal zippers faster tend to love plastic, and vice versa. The metal zippers are probably generally stronger and longer lasting when cared for properly, but I think plastic are fine if you keep them clean.
I thought that the back zips from 2017 were metal zipper, so just confirm it's not the super breathable fabric, and if so, I'd say buy it. If it's the super breathable fabric, only buy it if you are doing warmer water dives and you get an amazing deal on the suit.
The older dive rite suits are nearly indestructible fabric. The RF welded seams do fail after many years, say 5-10, but if you use Aquaseal on the seams, the fabric itself is bulletproof (not literally) and I love those older suits. You can find them cheap and keep them running for forever with tender loving care.
That said, my 10 year old dive rite is now my backup suit, and I got a great deal on a used Santi. It has similar issues regarding the cut, being not exactly perfect, and I don't think the fabric will last as long, but the seams are better done. Generally, you want to find a used suit for $250 if it needs a zipper and any other alterations, or $500 if it just needs seals and no other alterations, dive it for 2-4 years, then rinse and repeat.