Yea - bought the ZD201.
Well, the difference is 98% vs. 100%. The ZD201 are a bit lighter and easy on the eyes even after 3-4 hrs - the no-brand ones are a little heavy and good for 2-2.5 hrs at a stretch. In terms of picture quality - no real difference (to me and wife atleast).
One tip: if you go for the no brand ones - go for the NON-rechargeable ones. That way you dont have to worry about what kind of cheap battery have they put in there (in the rechargeable ones) and if the internal battery dies, you're out of luck.
I just Bought some cheap batteries for the non-rechargeable ones and have used them for about 19 hr each - so far so good (rs. 15 or so for a battery)
The consensus on a lot of different forums/amazon seems to be that $30 glasses can easily be as good as $120 ones - what you end up paying for is the brand and assurance that comes with it. The trick ofcourse, is to find the right cheap glasses. I usually just follow the reviews on various forums.
Well, I already got the ZD201s, though yet to try them as I am still waiting for the PJ. A couple of people had mentioned that they were more color neutral than others.