Those Tai-Ho Cubic look really great,if they came with 1U modifiers and I hadn't got a set of black DSA caps in the mail this morning I'd probably have ordered them.
They are pretty good for the price. I was at first disappointed in the thickness, but that's because i'm used to signature plastics DSA, Leopold, and Topre Fc660c keycaps, which are all nice and thick pbt.
When I put them on my cheap plastic iGK61 they really brought the worst out in each other, like they sounded so pingy and thin. But then I put them on my nice heavy aluminum 5 degree case with a brass plate, and they hold their own now. The case and the plate make a huge difference in feel and sound turns out. Still not as good as thicker, more expensive PBT IMHO but they feel pretty nice, look good, and aren't offensively cheap feeling. I haven't tried any cheaper PBT alternatives so my only point of reference are the more expensive caps.