My thoughts.....
There are definitely some duds out there, but with patience and a little research, I would have to disagree with knight66. There are some really amazing mp's out there. Well, moreso some really great attendants at some MP's.
The general breakdown in the Sun seems to be into 2 categories - licensed and unlicensed. From MY EXPERIENCE so far, licensed ones are the way to go. Generally cleaner, nicer, and they feel safer. They tend to stick around longer, so you can build up a trust, or find a repeat favorite. That being said, I have seen some of the worst MP attendants EVER at licensed studios. The unlicensed ones are more of a gamble, and I have only ever found one gem out there (still a personal favorite). I have been creeped out many times at unlicensed studios, they seem to come and go, be dingy, dirty, and have a high sketch factor.
That being said, let me recommend my favorite licensed MPs. Not for a particular attendant, but for generally good service, clean, and reasonable price:
Michelle's on Donald Street
Body Basics on St-Laurent
Body Care on Riverside
Maureen's in Hull
I hope this helps.