Always had a good time in cosmo (admittedly only been 2 or 3 times). Suppose I'm wondering whether someone like marcie is twice as good.
Never been to Cosmo so can't say, if your asking if she's twice as a good as your average parlour punt, I would say yes.
If you just want a cheap P&D & are not particularly bothered about DFK, OWO, fingering, CIM..... then go to a parlour or 2, if you want some hot, passionate, responsive sex with a hottie then go book Marcie but I'm not sure what you're into, if you did some reviews then I could have an idea of your taste in WGs & the service you like.
A review or 2 of the girls you've seen at Cosmo would be helpful