I've got the Hilti and the matching Vac, brilliant tool weight is the real issue. I have found that if you mark up as much as possible where all the chases are going,then set the vac up in the centre of the room and get around all the chases as quick as possible,then your arms have a slight chance of not falling off with fatigue!. Had a luxury job yesterday chasing a driveway, why can't sockets be mounted on the floor!. As for the Bosch as said above it's appalling doesn't go deep enough or wide enough only plus side weight, light as a feather, as for the others no experience first hand. The Hilti is worth the money, and if you want to save a bit don't bother with there vac unless you really want the 110v socket, you can get the identical vac from Nuflisk alto who incidentally make them for Hilti and half the price. cheers