I upgraded to the 3Gs from 1st gen iphone. I have to say that I like the flat back of the 1st iphone better. I use many apps where I set my iphone on the table in front of me and use both my index fingers (can't use both of your index fingers while holding it). The curve of the 3g/3gs makes my iphone rock and and forth now like a rocking chair which is very annoying and I have had to change how I operated my iphone now. Anybody else have similar feelings?