It is a lot more prevalent than you think. At my parlour, we have a large number of Romanian girls, however not one will state that fact on Adultworks or via phone. It tends to be as follows:
Dark Skinned Romany Romanian - Indian
Dark Haired Romanian - Spain or Portugal
Blonde Romanian - Italian
As for service, it does vary between girls. Some of the best girls we have are Romanian, but some of the worst girls are Romanians.
On the plus side, visually, many of these girls are absolute stunners. We have a couple of girls that work in high end strip clubs in Mayfair and have the looks of models. Sadly the reason they also work in mid- range parlours is because they have pimps behind them. It is not uncommon for some of these "beauties" to work 6 to 7 days in a mixture of parlours and strip clubs.