Wife and I both have the Eris. He have had no problem with the 2.1 upgrade. I would say that my phone is performing better since the update.
I think at least part of the problems people are having is not having their gmail account synced for contact back ups. A major mistake, it is a google phone.
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I learned this lil google contact sync trick from the Verizon tech. But keep in mind that you are syncing live to your google account for email, contacts, and calendar. And if your are having the problem syncing your contacts, just unmount your MicroSD chip and try syncing again with it unmounted, this usually does the trick and syncs perfectly. Maybe ya'all have done this already, but I had to do this when I installed the 2.1 upgrade.
My wife's isn't ringing at all. The boot animation has no sound as well. I've checked everything I could, including doing battery pulls with and without being powered on, and a factory reset in which she lost all her contacts. I'm taking it to the verizon store tomorrow and either getting a replacement or maybe get her an incredible.