I've had a Zox modular helmet for the past couple of years and have not been very happy with it. The inside plastic lining of the flip up portion of the helmet came unglued fairly early on and it took me three different attempts to reglue it before I found a glue with the right amount of give in it to stand up to the constant flexing that happens when you open and close the flip portion. Changing the visor was a real hassle as well. Lastly, it was almost impossible to latch it without using two hands - one to steady or counterweight the main part of the helmet while the other push the flip portion into place. Whenever I forgot to latch it before taking off, I would have to stop the bike, put it in neutral, and use both hands to latch the flip closed.
I've just switched to the new HJC SyMax II modular. Not too expensive (I've seen it advertised as low as $230), it seals way better than my Zox does, comes with speaker pockets (as opposed to just a hollowed out area in the inner lining), and has an absolutely nifty internal sun visor (separate from the external wind visor) that you can easily flip down with your left hand when you ride into the sun (which, I take it, the Zox Genesis also has). Saves the hassle of stopping to put on sunglasses or a sunglass clip-on. With the HJC, if I forget to latch the flip before putting the bike in motion, I can easily latch it on the fly.
Bear in mind, tho, that all modulars are a bit noisier than a good full-face. However, they are pretty convenient if you wear glasses. Also great for scratching that itch, picking your nose, having a quick drink or snack during a pitstop, or simply leaving your helmet on during brief errands off the bike. So, if you decide that you want a modular for any of these reasons, I recommend that you give this helmet a look.