crazy wroteYes edge is enough, I beleive you on words, never used it, but I am not convinced that a person downgrading from 3g to edge is enough for him.
it all depends on how you use your phone. if you don't use services that require 3G, then you don't feel a difference. if you stream high res videos, check high res pictures from your phone, download big attachments, ... then ok, you'll feel a difference.
for example, if you just browse on your computer, just browsing, nothing else, no downloads, nothing. would you feel any difference between a 10MB connection and a 100MB one?
if you don't use services that make use of that extra speed, you wont feel a difference, same apply for phones.
now maybe you stream a lot on your phone, upload lots of pics to your flickr account, facebook, ... take videos and send them by email, ... i don't know, it depends on how you use your phone. but for me, i don't, so i don't feel much difference. the things i do are not bandwidth hungry. mainly email, rss, chatting, and google/wikipedia from time to time.