Trust your gut instinct. Ask lots of questions, and don't accept poor communication or excuses ever. PM, email, text, call each other, and don't hesitate to ask any question. If you get slow or no responses, well that is how you can expect the deal to go. However, I'll deal with slow or no responses if the person has 100% feedback and 50 deals, I mean, they earned it. Trust your instincts.