It's not TOO High, but that is a decent price for what I've seen them going for these days. They are reaching the $200 range when I've seen them lately.
Are they worth it? Depends on how bad you want one. At $175, I'd be very tempted. Chinese mags are no longer imported into the States. Probably will never be again - The '89 ban put a stop to that. So what is here is all that will be in circulation.
Comparing Chinese to the Romanian drums is kind of night and day. The Chinese drums are unique in that they can be loaded by opening the back and simply dropping the shells in. The Romanians have to be loaded like any normal mag from the top and can be tedious and rough on the thumbs.
The Romanians are excellent drums. Very solid, but the loading issue turns people off sometimes.
Make sure the drum in question is indeed a 100 rd. drum and not a 75 rounder. I've seen people claim to be selling a 100 rounder, but it was really a 75. Unless you have two side-by-side, you might not be able to tell. I don't know the exact dimensions. One way to tell is load it with shells and then count them.
Hope this helps!