Most public course designers are careful not to design greens where someone may be on the actual green surface, yet forced to chip. I am certain greenskeepers hate that!
Save your 'u' shaped greens for people who have the money for maintainence! They fall under the category of cools things you should rarely do.
Lassing Pointe has a 100+ yard green, set diagonal across a pond, where pin placement can change your appproach club from PW to fairway wood. Most of the pin placements they use would allow you a long [perhaps 250ft] putt, rather than a chip; God forbid. Still, a very nice Hurdzan design.
Doug