I have the v.1. and v.2. AP ROO Diver and the v.2. is MUCH shorter on your wrist. According to my caliper, v.1. is 15.23mm and v.2. is 13.00mm. As you all know, 2mm makes a HUGE difference in wristwatches. I wouldn't call v.2. "flat" (like I would a PP Nautilus) but it sits MUCH lower on the wrist. I have ordinary sized (7.5") wrists and it sits very comfortably on my right wrist (but not my left unfortunately) because of the spacing of the holes in the strap- on the left, it's either too tight or too loose and this is also true of my AP Chronopassion which I have on an AP Straps strap. The crowns on v.2. are much much larger and far more accurate to the gen. I bought the v.1. about six months ago to get a feel for the watch and while I really loved it, I couldn't get used to the smaller crowns, the thick case, and the fact that the rotating bezel lacked a screw down crown, didn't ratchet and would rotate in both directions (I know- three strikes too many). V.2. is a whole different story though and I highly recommend it.