AfterDarkLasVegas.com
Does anyone here have experience using them?

You seem to have chosen well in LA, you're heading for a let down in Vegas.  Have you found any TER reviews for any of the ladies on that site?  I had seen the name "Lisa Marie" before.  Her last review on TER was back in '03.  I'm not saying all the ladies on that site are of similar modus operandi, but, seriously, you simply need to use the TER search function and I'd lay odds you find a sure bet.

See the discussion of a few days ago regarding this agency.  CindySpice has some worthwhile comments in this regard.  You will be better off doing the TER Search.