I'm one of those founders, last time i put out my email for anyone needing advice I got like 20 different people asking me questions. I'm happy to answer any questions in the forum.

This is what think:

1. Don't worry about VISA until you get accepted, it will take too much time

2. To get the right VISA is hard, lawyers will tell you what the law say, not necessary what is the right thing to do in the situation

3. Don't be too honest at the border control. I had a friend once who where touring with their band in US, at the border the asked if they where going to work in the US? (I.e get paid) and they were honest and said yes, the border threw them out. As long as you are not earning money in the US, you're best off by saying you are on vacation.