I had one, like it because of it's potability and power in a small package, but I changed to a more powerful shop vac for a cheaper price. Metro is good for mobile b/c it doesn't take up much room, but IMO there are better vacuums out there for the price.
anything from sears or lowes with more power, and on sale. Picked mine up from sears last year on sale and have never looked back. It's a little bulky, but has a super long hose and a ton of attachments.
Put me down for having a shop vac too. I never purchased a metro vac, but I have tried it. While it performs well for it's size, if you are working at a fixed location there is no reason to spend that sort of money, when you can spend less and get MOAR POWA!