Is the LG enV touch for Verizon a good phone?

I'm interested in ditching my T-Mobile G1 for Verizon (which I heard has excellent service everywhere) and I've got my eye on the LG enV touch. I was just wondering, how is the AIM on the phone, and is it generally a good phone? If you've had any experience with the G1, would you leave the G1 for it?
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