I don't see much (actually any) mention of the Tang Band tweeters. Does anyone have experience and opinions on the following TB tweeters?

25-1719S - ceramic coated aluminum dome
25-1166SJ - silk dome (looks like a cheaper version of the 1719S)
28-847SD - silk dome
25-1744S - ceramic (coated aluminum?) dome with screen

These look interesting and the prices seem good. The ceramic versions look to have a bit of rising response in the FRs, but otherwise the response looks quite nice. The 1166SJ is pretty well priced at $21. The two ceramics get close to the Vifa NE25s that I like in price, but if they sound as good, might be a good alternative.
Any experiences and opinions are welcome.

Thanks.