I've only visited Blair St (BSS) and Newtown Saunas (NTS). Price wise, 30 mins is £20 on the door, 45 mins is £25 and 60 mins is £30. You also pay the girl £50, 60 or 70 respectively based on the time. Basic service included. Most do owo but make sure you shower and have good breath. Other services usually extra (eg cim £10, A £20) I like it because you get to see the girl beforehand in the lounge, have a chat with her and the two of you can get the measure of each other. I've had some great punts with girls when we've clicked in the lounge beforehand.
Others may disagree but mostly I've preferred the Scottish lassies. There are a few Romanians in BSS and NTS and I've yet to have a really good experience. The only one I did enjoy got fired from NTS, not sure what for. There are some good Latvian, Polish and Hungarian girls though.
It depends on your taste and age but for me in BSS Diana (Lat), Heidi (Scot) and Betty (Hung) are all good. In NTS there's Shia, Jennifer, (both Scots) Lexy (Aussie) and Tara on Saturdays.
My advice would be to ring up, see whose description you fancy and give yourself some time to meet them and decide.
Enjoy.