cheap ds18b20's, are they legit??

[Heckler]

I bought 10 of these, and the price is un-beatable (if you can wait for delivery from hong kong)

BUT I can't help but wonder if they are genuine or knock-off's.
What do you all think? The price is amazingly low.

They do all work but I'm not sure they all show the exact same temperature... I need to work out code where I could place them all in a line on one wire and read them sequentially using the addressing feature. Right now I have to pick them up with a pair of pliers and put them in the bread board to read them.

Could it be that they are seconds??

http://cgi.ebay.com/10pcs-DS18B20-DS...item3a59df8b54

just wondering...