What is so special about ATC capacitors?

ATC capacitors are expensive, relatively high Q, various sizes, various values available, plus they have the values printed on the capacitor.

If you're going to pay S5 for a capacitor, it better have the value printed...

I use them in my research and they're very nice for building high Q circuits. Though inductor Q always limits things anyways...

ATC have some microwave capacitors, its SRF is very high, can uo to 40GHz. Muruta also has such microwave capacitors.
ATC also have high power capacitors.