Abusive, crass, unprofessional. They sent a ton of emails that I had to take legal action to stop. Founders are a couple of techies who are yet to learn the finer points of fair debt collection practices. (Talking about you Ohad and Nadav Samet)
Here's an example of their emails:
"Are you just slacking?
Stop that. This is serious business. If you don't handle your debt to XXXX, it could have a long-term effect on your financial standing."
My suggestion is to file a complaint with Consumer Financial Protection Bureau if you believe that your rights under the Fair Debt Collection Practices Act are violated.