I know why this is a Number One Best Seller.  First of all, my wife was dead set against getting  a cannister vacuum. I ordered it anyway, since I do most of the cleaning on our terrazzo floors in a sandy beach environment in Florida.  It works amazing. The suction is Very Strong, and it picks up sand and dog hair (we have a Lab) as good as any vacuum I've used, and better than ANY upright that I tried.  I wanted a bag style since it doesn't require cleaning every time, and this is the suckingest (is that a word?) bagged cannister I could hope for. The wand is extra long for getting under the couch and other furniture, although the floor brush is low enough to get under most everything anyway. It has a 12 amp motor, which lots of uprights don't even have.  The wheels are well designed and follow you accordingly, and the cord, being 20 foot (which wraps nicely under the unit) is plenty long.  Oh, I almost forgot; my wife now loves the Mighty Mite and she's a pretty tough sell after 33 years with me.