Allure is pretty much aboveboard on the services offered. You can get topless, nude, or nude reverse. There is no bodyslide offered., nor anything "hidden" beyond that.
The buzz about Allure comes from consistently good experiences as they do a good job of screening their attendants. In other words, it's less of a crap shoot than at some of the other establishments.
As for the lack of pictures, they are putting some up, but if you read the text descriptions they are fairly accurate. If you have a specific preference hair colour, body type, personality, etc., then mention them here and I'm sure you'll get some helpful responses to assist you in making a choice.