Myself, as well as others, have been told (over the last few years) --- that "confirmed' COMP rooms are not a guarantee, much like when you ask for a king bedded or smoking room (which are considered requests). I've accepted this fact over the last few years, but have had good success at getting the desired type of room (i.e. Augustus Tower when checking into Caesars).

I decided to do an experiment, and sent Harrah's an email earlier today, posing this same question. What follows is the message and response :

my exact question :

and the answer around 5 hours later (bolding mine)

Now, I guess that I could ask what does "confirmed in that room type" really mean --- but, that really does seem self evident to me. So, I guess, I'm going to carry print out of this email response with me at check-in --- in case a front desk clerk tells me that the "confirmed room type" is only a request.

Note how I "specifically" refer to "requests" by comparing the room choice to the request for bedding or smoking as noted "I understand that bedding and smoking requests are just "requests" -- but, when given multiple COMP room options, are these guarantees?" --- I wanted to make sure there was no misunderstanding, and the answer seems to take this into account....

So, skofarrell and others --- seems that the front end staff at Harrah's properties are trying to convince us that we can have whatever room they want to give us --- but, corporate thinks about it a bit differently..... Hmmm...... This response is good news, though, you still need to be [possibly] prepared for an argument, unless a host has pre-assigned your room before check-in.