We just went through this (Score 1)

We pretty much recieved a letter from thier lawyer on day one. The letter acused us very vaugly of a list of things we didn't do. We were very upfront and honest with our lawyers and they suggested we just meet with thier lawyer and tell him our story, which we did. And like you we hadn't signed a non-compete and had taken nothing with us. Alreay long story short we haven't heard from them since, but they can always sue you and try to keep you in court until you run out of money....Hire a good lawyer. :)