Yes, this one is great and was quite cheap. Speed is excellent and even the multiblock write feature work without crashes for me with this card in N770. Great for booting from mmc hack too, cuts boot time to half with this card. It is great also in n800, uses low voltage and is as fast or faster then 150x SD cards. Too bad they don't make 4GB ones, I would buy it both for my N770 and N800 at once. I hope they will make it some day.

On the other hand, if you don't plan to flash custom kernel and don't plan to use it in any other device, any plain MMC card will do as the speed limit of Nokia kernel is far below the speed of slowest MMC card on market.