For the C in these amp places which pay $300+ an hour, they have to be good otherwise they won't be working here. They certainly don't have the good looks or age compared to the K and J girls so their service must be good. Most of the ugly and poorer service C girls ended up in Flushing and unfortunatly in Brooklyn. From where I live, I have a UTR place for Chinese only 3 minutes walk from where I live. But after trying out that place 2 times, the girls' service is just poor but loney C guys keep visiting to that place which keep that place running. Considering that the Chinese economy is doing well in general, I don't think you will see alot of younger C girls who will replace these older C girls.
I recently posted a thread about J girls coming here because the economy is so bad at home. Most of them are 'tourists' here and a handful of them somehow secured fake work visas to work here long term. Who knows, maybe more of these better J girls and willing to stay in the long term. J girls have the youth but they most of them don't have the experience compared to K and C girls.
I had K girls since the KMP days and I would say the service is just average with them. But compared to K and J girls, I don't have alot of experience with K girls. Who knows, maybe if the economy to South Korea as bad in Japan, we will see more K girls coming to the states.