I’ve only had this unit for a couple weeks and decided to buy it because it was on sale and seemed like a really low price for what was in the box, and because I had purchased one other diffuser in the past and felt it represented good value. This unit is not designed for every day heavy duty use, but for part timers like me, I think it’s well worth the money. I didn’t need to watch the entire 30 minute video on how to put it together. If you’ve got even a little bit of a mechanical inclination, you’ll have no problem. I like that the casters are dual locking; the wheel locks so it won’t rotate and the caster frame locks so it won’t turn as well. It’s a good unit for people like me or as a starter unit for the student just starting out and learning as they go.