Actually, the DC07 is capable of commercial use, as how matt has demonstrated, and FYI I have used my Dc14 for lasted dusty, and it never burnt out, same with my dc08 origin which uses the same motor, but without a spindle, and that one has been kept outside for four moths, in the snow, been used for plaster, sawdust, gravel, you name it. And it has been bashed around, and that thing still worked fine.
I would rather use a DC07 than a Henry for commercial use, because the peter ones, and dysons nowadays dont suffer from snapping plastics, they are flexible, so are almost importable to break under normal use, or even commercial.
Yes hey are designed for domestic use, but Dyson can work better.
Dyson say dont vacuum up water, but you can.
Dyson say dont use for commercial use, but you can.