Thought I'd post a quick review, since I own a couple of these sets.
As others have said, you can occasionally find these in decent or new condition on r/mm for around $100. It's a nice set, and an interesting piece of gmk history, since I believe this was their first foray into custom colors.
However, the color matching is not good. If you're looking for an accurate replica, the recent GMK TA 90 set is much closer to the original. That being said, the teal mod color is quite unique, and works well with many other keysets. For example, these mods look very nice with alpha caps from an old CompacTA or Gabriele.
Aside from color-matching and layout issues, I think the biggest problem with this set is the alpha legends. For some reason, there is a bit of bleed into the lighter body color, which makes the legends appear slightly fuzzy. I have never seen this in any other OG Cherry or GMK keyset.
Personally, I don't think it's worth $125 in 2020. But obviously that's your decision to make. Regardless,
I'm fond of gmk, and I can say that I'm happy to have this set in my collection.