looks like a great app!! If you have a little savings and your job offer isn't too stellar, I'd say run with it. Assuming it contains a useful set of features now, focus on marketing what it already does and worry about replacing your co-founder as a secondary problem. Unless of course your co-founder was the one you were counting on to do the heavy lifting on marketing and early adopter customer support.

Nope, he's strictly a builder. I'm the talker. My degree is computer science, but he's a way better programmer than me.

Thanks for your advice!