Real Wisconsin Frozen Custard is an excellent treat and this is pretty good as far as WI custard is concerned. (Not the best in the state, mind you, but good.)
The prices have gone up a little faster than the quality or quantity over the past few years though so, while it is good custard, I don't feel that it is justified UNLESS the flavor of the day is something you just cannot pass-up.
The nearly ubiquitous Culver's also have good frozen custard and flavors of the day... and the prices at Culver's are more reasonable. (Sorry Michael's, but you charge WAY too much for a simple hot fudge custard sundae!)