I've been a mutt user for years and I was skeptical when I came to know about gmail. After I started using it though, I started to see all the good stuff, mostly the ability to access my email with just a simple browser, the end of email backups and the spam filter.
I then tried to go back to a dedicated email client (even using my gmail account via IMAP), but fell back to web based gmail usage every time.
So I was wondering, what are there reasons NOT to use it, if any?