Here is a link to one of the many discussions on this property:
when you click on this link then look on the right hand side of page where it says more like this.
Thx but your specific link doesn't actually address the question and other links on the right handside kind of does but they were posted in early 2012.
Are there any updated info? Al from one post said Plat Elite treated well but others said need to sign and activate Identity (which I did).
So, Plat benefits are some what offered like wifi or breakfast? Thanks.
Hopefully Al will be able to give you a few more details.
I think the quick answer to your question is there are some extras offered but only for Platinum level members, specifically:
There is free Internet and phone for Platinum members. This has been complicated a little as of this year as the Cosmo is now charging a Resort Fee of $20 per person per day which is supposed to include Internet, phone, and access to pools and their gym.
There isn't an executive lounge as you would find in other Marriott hotels but there is free coffee and juice offered to Platinum members from 6:00 a.m. to 9:00 a.m. in what they call their Identity Suite. If we can wake up before 9:00, we always take advantage of not having to wait in line at one of their coffee houses.
Other Platinum benefits include one free breakfast for two at the Wicked Spoon buffet (something like $75 for two otherwise), extended check-out times, and a Limo upgrade when you reserve a regular car to pick you up/drop you off at McCarran.
Hope this helps.