I installed my own MD System unit in 2000. The unit works very well, still. Tools and hoses are built well, but I have had to replace the hose twice in 14 years (stepping on them and kids are hard on the hoses...go figure)

Triple filtered so the exhaust is very clean. And that filtering also protects the motor, which is probably why the unit is still running 14 years later.

I think lugging a 35' hose around is a small price to pay for all the other benefits. I will never have another house w/o a central vac.

If in a properly designed and installed system, their suction is vastly superior to most uprights and canister vacs. Only my Sears Shop Vac has better suction.