Yes, I mainly rely on YouTube product reviews and demos for video games, and other things like electronics, game consoles, and cell phones before I buy. I can see the user using the product in the video, and hear his opinion on it and know if it is good or not in most cases.
Same for me, I like trying it out as well, but if it is a cheap or a product which is very known for being high quality like the Wii,PS2, etc. I just buy it online.
Usually the opinions on the video are a lot more useful then the opinions from the sales staff at a electronics store since sales staff never talk about the bad things about a product while a video tech reviewer usually does talk about the good and the bad parts of a product.