I'm heading to Vegas in a week. Currently I have 2 nights paid for at Mandalay Bay followed by 1 comped night through MyVegas. Last night I came across a deal where I can stay at the Delano for the first 2 nights for basically the same price (+$14), seems like a no brainer. My question is, what are my chances of getting my last night moved to the Delano? Think I should try the doing the $20 trick? I'm basically weighing the pros and cons of if I can't get upgraded and how much time I might waste having to switch rooms vs. having a nicer room at the Delano. Thoughts?