Leszek Scholz, Feb 18, 2007; 08:30 p.m.
It is definitely a good buy - money wise. I do not know about quality.
But usually you get what you pay for. There is a reason for good filters (ND grad) to cost from U$60 to U$130 a piece. On the positive side - if Tian Ya filters are bad, you do not loose much. Buy and see.