there a several escort services in vegas, are all of the scams or are there some with good reputation and which ones are they?

TER is your only save
bet in vegas you put your money on anything  you will lose it IMO

There is one that got banned from here for posting fake reviews, but I have talked to people who have used the service and they were happy.  I am pretty sure that I am not allowed to link to them, so do a Google for Pretty Maids in a Row.
 Or, check out my "Friends" page.  http://www.misslogan.com/html/friends.html

thank you