had mine since early december and everything is great. do have a very small bright spot on screen but that was my own fault. removing the inivisible sheild was not very friendly to the device! the device is great tho, especially since installing easy debian. people are always amazed to see a full blown desktop running, especially when i show them gimp. in short, i love this device and i think its rock solid.
overal I'm very happy with my N900. No problems like dead pixels orso. The big complaind I have are the bad (foggy) pictures that are taken with the flash on.