Clark Richardes wrote a review of Jetboil Zip Cooking System on July 20, 2013
Familiarity: I've put it through the wringer
My only gripe with this stove is that the knob that regulates the fuel is too small and slippery. In fact, while cooking some ramen noodles I nearly blew myself up (lol!). I took my eyes off the stove just for a second and I had boiling water overflowing. Since the knob was so small, it was a sketchy situation trying to turn down the fuel with boiling water overflowing. With the more expensive Jetboil's, the fuel knob is longer piece of wire that extends out more, making it a heck of a lot easier to turn the fuel on or off. My friends still laugh about that time I almost blew myself up with the Jetboil.
Outside of the fuel knob issue, this is a great stove. Lightweight, packs easily, and boils extremely fast. As far as the specific Jetboil ZIP model, I would recommend spending the extra $20 and getting the Jetboil PCS, just for the extended fuel knob. Although, most people probably are a lot more careful when cooking than I am.