There was one near my old office and I totally loved it. Ten daily flavors (well three that were always there and seven that rotated) and fruit and other toppings. This time of year, it was lunch more than any other place.

They of course were using the drug dealer mentality, get people use to it, and then go up in price (you paid by the ounce) pretty much raising the price 75%. They are still pretty busy though.

You need to be in a huge traffic area and have to offer something else (this was offering coffee too)