My advice
DON'T DO IT!!!
stay with 1.5, waaaaaaaaaaay more stable.
I have 2.1 and it SUCKS!!!!!
I'm going back to 1.5 if I can.
Just my 2 cents...
I disagree... There's a good chance that if your phone was/has been good and stable (i.e., no silent bug, no flakey behavior) on 1.5, that upgrading to 2.1 will not cause you more problems. Quite the contrary, you'll have a much better overall experience with 2.1 with all of the "goodies" and and options that this upgrade provides (more available apps, various bug fixes, various new features, the option to root (for some), etc). This has been mine and many others experience.
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