hahaha I am wondering if I can tell the difference in weight! But anyway I have done the change of my N9 64GB to Cyan. Through this process, i stripped one of the screw so I have one less screw in my phone. I accidentally spoilt the new usb door. But this is my first attempt and I am sure I will do lots better in my second attempt. I will try to change to a white one in the future (maybe in 6 months time) Anyway the whole process is rather simple. The most difficult part is the unscrewing of the screws. They are all so tight that it feels that Nokia has welded them in since the screws have black spots around them. After the screws are out, i finish the rest in like 10mins. So, an advice for anyone trying it the first time, get a good screwdriver and unscrew the screws slowly and steadily. Don't rush, unless if you want to strip the screw. btw, can anyone recommend a seller that has good full white housing with USB cover and SIM tray? The seller (freetrade21) that sells me mine seems to have removed his N9 housings from eBay