It's a big unit. So with a big screen, you'll need power. So the battery won't last as long as a 14" screen like the W3. I would say the W2 is very portable, for a table or office, but not for a crowded classroom. You'd be surprised at how light and thin the W2 is. The size and width is still there- it'll be hanging off your desk and people behind you won't be looking at the professor, but at your giant screen.