I visited the centurion lounge in LAS yesterday, So let me share my experience.
1)
You can't enter with a canceled platinum card, As they swipe your card at the front desk to see if it's active, i gave my canceled card at the front desk and they told me right away sorry your card is canceled, But i was lucky enough as i applied for a new platinum 4 days ago, And when i turned around to leave the lounge they called me back saying that they see i was approved for a new card 2 days ago, And they will let me enter even tough i have not received my new card yet. and the rep couldn't get over the amount of canceled platinum cards i have on my account
2)
they have a full kosher menu always in stock no need to reserve right away when i entered i had a friendly chef walking over to me without even asking, asking me if i would like a kosher meal and they had the following main dishes served with 2 sides of Mashed potatoes and cooked vegetables a roll and 2 pastries as a desert.
Mini roast
Schnitzel
Grilled chicken
Baked Salmon
I chose the mini roast and it was fresh hot and delicious. the meals are catered by Haifa kosher restaurant in Las Vegas.
Overall the lounge is beyond beautiful, alot of private spaces with conference rooms, and brand new beautiful designed private showers. A fully stocked complimentary bar (i emptied the whole Glenlivet 21 and they apologized for not having more for the night
)
They have a very helpful service desk as well, They helped me with switching seats and tried to upgrade me to business but they got stuck in the middle since the flight started boarding already.