there might not be any reason to upgrade for tried and bought original psp owners but i must say that it definitely looks enticing. as for dl'g' yeah old psp's can play it, and yeah PSP Go can't play UMD's but i heard that there was supposed to be a way to transfer umd games to the psp Go. so between the two i'd prefer to have the Go, due to sleeker design. but all in all i'm guessing it's just way better to wait for whenever they release a PSP 2 :)