Here's what you can probably expect:
Fairly decent to extremely good looking woman, generally with crappy attitudes.
You'll pay too much for sub-par service. Also you'll generally have to fork over 40 - 60 for a room at some flea-bag hotel on E. Hastings or in gastown. Occasionally a girl will take some or all of the room fee out of her fee, but this is really the exception, definitely NOT the rule.
You generally won't get anything close to what is considered GFE by most people on the board. Consider yourself lucky if she even takes all her clothes off.
Expect to be rushed to the finish line if you take longer than say 20 minutes or 1/2 hour. Remember, they're working the streets - usually for someone else - so for them, a high turn over means more $$ and more $$ means they can come of fthe streets for the night earlier (or have more dates to make extra for themselves). Generally "Union girls" (girls working for someone) have to make X number of dollars per night to make "quota" so to speak.
Occasionally, you do fund a gem out there, but they generally don't stay around long (on the streets anyways - some go indy, some just go) and if they're independant and on the high-track, typically they don't last long and most get pushed off the track to somewhere else.
Best of luck, hope you find a gem, but in all reality, your $$'s will be better spent with an indy or even at an MP or agency.
SWG
