I am using nokia E63 since Feb 2010 and found it very useful for mail/browsing and internet telephony call purpose.
It is truly a business phone with value pricing. with solid built and long battery life you can always rely upon on this phone for stability. I never found its OS hanging or call drops etc. with 3G available in india though this phone does not have HSPDA moderate 3G speeds can be achieved which is good for VOIP calls.
Now some dark shades to the picture . phone is strictly for business purpose and not even a single game has been provided with the OEM kit. You can get games for symbian OS but they are not as attractive as they are for android or BADA. Apps are also available but interface is not intuitive.
Overall I would recommend this product to user who are using it for business or general purpose most of the time. Also last but not the least there are better options available now from nokia with GPS and better camera.