Thanks for posting!
Chen did a really great job in the first videos interview imho. Stand-up product presentation is a hard thing to do without sounding like a vacuum cleaner agent. Especially since english is not his first language. It is on thing to have an interviewer ask specific questions and have a casual conversation. But a whole other ball game to politely wrap up a product without missing a thing and still give the impression you are really doing what you love. Standing ovation from my side.