I got a class 10 wintec 32gb microsd from newegg not too long ago. If i remember right it was right around $80~ shipped with lots of good reviews and wintec being a very good manufacturer. Any who, used it in my n810 for a month or two before i got my n900. It currently resides in my n900 storing all of my music and indexes very very fast i can say it was faster than my class 6 16gb when it was in my n810, and when i put it in my n900, i could get reliable 10MB sec write and very fast but not measured read speeds, both on the device and copying to from windows through usb. When buying flash memory, cheap fake knock offs with 10% of stated memory are rampant, not just on ebay. I recommend going to a good vendor, (like newegg) and buying a brand name card with a return policy and possible warranty. Even if its a little more, its definitely worth it to not have to worry about compatibility/getting burned.