The unit seems to function quite nicely. I tested it with cigarette smoke, and it seemed to do the trick. The hose bends quite stiffly, which is good, and holds its position. The unit has 4 modes that the on/off button cycles through: 1. Low 2. Medium 3. High 4. Off The light on the on-off button is handy to know what level you're at - a nice touch. I'm only giving 4 stars as the inner threads on the bottom of the unit for the castor wheels weren't quite right and I had to re-tap them to clean them up and get the castors to screw on properly. While this is a minor inconvenience, my bet is that some people won't have taps to do it in their workshops. Also, you MUST have the castors on, or at least have spacers at the bottom as that's where the exhaust port is. If I remember correctly, my unit needed an M8x1.25 tap. The threads measured SAE 20 NF (i.e. same pitch as 1.25), but none of my fractional inch taps fits - only M8 fit. That being said, the castors make moving the unit very easy and they lock in place nice and secure. For my workshop and for my lab I'm still thinking about a couple scenarios where I may have difficulty using the unit due to the limited length of the hose. I think an excellent accessory (which I may end up making myself if I have to) would be a type of extension like a soft flex hose that attached to a HEAVY brick/base that the main flex tube then attached to. An extra 6' to 8' would make it very easy to move the unit \"out of the way\" in scenarios where you've got limited space.
Sascha 
