The other night Chris and I spent two hours test driving vacuums. Two hours. In one store. When it comes to vacuums all I care about is if it sucks everything up and doesn’t make me choke when I empty the canister. Not so for Chris. He needs to know which one’s the lightest and has the best motor. How does that stair attachment work, anyway? As far as I’m concerned as long as all the cat hair’s stuffed into…