I have very unusual situation. My current employer is going to send me to USA in few days to perform "kind of research" and i'm going to travel during my free time.
Let me describe that "research". Our company is shipping car to USA and then we need to test some equipment installed in that vehicle (cameras + sensors etc). Basically just driving and testing that everything is ok, sending reports and data directly back to my country. That's it. We are paid from my country, no deals or service for any US individual or company. We need around 3 months to be done. Then we are going to Canada, Mexico, Colombia, Australia etc..
Are we ok with B1/B2? We never had any troubles with business visas anywhere around the globe.