Although I had avoided flip cases up until recently, I became a semi-fan of them once I realized what that little hole was on the front covers of some of them. An ear hole! Dial (or answer) on the phone screen, close the cover and talk! No more holding back them pesky flaps!
And once some of the makers cut slots for credit cards inside the front cover, and made the slots low enough that the inserted credit cards were still below the ear hole, that was the ultimate move!
A wallet AND no flap holding!
But I still rotate through some other different wallet-type cases as well because those flap credit card slots only hold one or two cards and I need room for at least four-five. Plus some cash. So I use the Ultra Flip, RevJams and the (still incoming) knock-off from ebay for the times when I'm just heading to the gym or to Starbucks or wheeling my kid to school and might only need my ID and credit card or a $20 bill, if even those.