We upgraded to the premier experience, but it wasn't really that exciting.
It's true, the rooms are quite dark. The bathrooms, however, are huge! With two sinks, both of us had our own pampering and make up station. The shower stall was large for a shower stall but I prefer a bathtub shower combination. And they offer you 500 SPG points if you refuse room service. I like the bathrobes and the 3 bottles of water free per night. Except the crappy part is that if you refuse room service you don't get your water bottles or shampoo or lotion.
I do find it convenient that the Miracle Mile shops are right there. The hotel is also conveniently located on the strip. For that reason, I would totally stay here again.
The casino is pretty stylish compared to the others on the strip. They had a good amount of food places . My favorite this about this hotel was that the premier experience rooms had an iPod dock for an alarm clock and that made it so much more fun.
But for NYE's we were paying premium price and I would have expected a lot more benefits, than just a free bottle of alcohol.