I have been frequenting the Milkshake Factory for almost the past 3 years, and have had an array of different milkshake flavors from salted watermelon (made with sherbet) to my stand-by fave chocolate banana (made with real bananas). I like to go in on Wednesdays for their Milkshake happy hour - 1/2 off milkshakes, or as we like to call it "Buy one get one free". Just make sure you get there early for that, or you'll be stuck in line for awhile.
I've also had their chocolate, and I must say - it's some good stuff. It is a tad on the pricey side (mine was a christmas gift), but definitely yummy.
I absolutely love this place.