Not to mention the germs! I know the sheets would be clean but what about the netting and the top rails? My DD is at the age where she stands up and just puts her mouth on the top rail.
We used the resort PnP's and always found them in excellent condition, a few times they were brand new and others very lightly used. I always brought my own sheets as they were familiar and clean and did a wipe down of the surface and rails.
On the off chance you get one that isn't accpetable you could request a better one - they seem to have them readily available.
TJ
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We've always used the ones the Disney resorts provide without any worries or problems. There's no way I would drag one with me, when a perfectly good, clean, and safe one is available there. (For the record, I will admit I'm not one of those people who spends a lot of time worrying about germs. We even like to live dangerously by leaving the comforters on the bed!)