Phone's always busy because from what I've read on the Manchester specific forum, Jane the owner, has spent 10 years building up the quality and reputation of the site, so it's very busy, and the girls are nearly always of good quality and you will get the basic service it advertises done well.
Only thing I don't like is that the portfolio doesn't lists a girl's extras like CIM or A levels, you've got to ask on the phone.
And the photoshopping out of tattoo's. If you have body art, show it off, if punter doesn't like tattoo's it's just going to piss him off if he misses the bit on the sidebar where it says "Tattoos : Yes."
But I've only used them 3 times, as I only punt for treats like on my b'day or Xmas, but all 3 times were excellent.