@snapeuh I've got the Nifty MiniDrive myself and have to say, it has been awesome. Placed my Dropbox + OS X photo library on a 64GB MicroSD card, leaving me with all that space on my MacBook's 120GB SSD.
As for reliability: if you're syncing stuff that's in the cloud anyway, you won't have any problems if the MicroSD dies.
Would definitely recommend it.
