I am a long term Verizon customer. Must be about 15 years now. However, my Bionic is my last Verizon phone. Not because of how they and/or Motorola treats the Bionic. Not because it is taking forever to get ICS on the Bionic. Those are frustrations, but not show stoppers. Verizon does have a great network and a reasonably competent support system.
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I've been a Verizon customer a long time too, years before it was Verizon (not quite bag phone but...). I have an unlimited plan too. Right now I have 3 line 2 have unlimited data the third does not. But what I'm going to do is buy an new phone unsubsidized. From what I've heard you can keep the unlimited that way.