These are some of the reasons I bought the flip-up versus a full face:
* for me, the whole front flips up, so very easy to put my glasses on, no glasses, no see, no stay on road
* when fueling up, very easy to pop the front up, put gas in, drop it back down, take off
* my wife and I will carry a couple of bottles of water or soft drinks in a collapsible cooler in the "trunk", pull over, grab bottle, flip up helmet, drink, save bottle, drop down front, take off
* we do not have a communication system yet, so at a light or stop sign, very easy to flip up the front, talk, then flip down and on our way
* I find all sorts of little moments popping up where having the ability to frlip the whole fron of the helmet up is more convenient then just the shield
Also, keep in mind that if you want, you can flip up just the shield as well and not the whole front end, the IS-Max, as other HJC's, also has the sun shield system which I like very much. Can drop the sun shield down and fits easily with my glasses on.
Personally, I like it very much and would buy a flip up over a full face again if the chance arose.
My wife has a Fulmer M1 flip up that has a nice pink and white pattern on it........if you are looking at patterns and such