To find the right shoe you really need to go to a running specialty store and have them analyze your gait. You might pay a little bit more at a running specialty shop, but realize you are paying for the person's experience, knowledge, and individualized attention.
I work at a specialty running store and in my opinion (5+ years of running retail, 15+ years of experience as a runner) the Zig-Tech shoes are crap.
I'm not sure that there is any such thing as the right shoes for everybody. If they are comfortable and allow you to run without injury, then they're the the right shoes for you.
Personally, I don't think the wonderous mechanical construction that is your foot evolved to do its running thing with a huge bit of zig-zaggy-rubber on its soles. There is some evidence that increasing the amount of padding on the bottom of your foot, increases the impact force, as your foot tries to hit the ground underneath your rubber zaggy bits.
Michael, the Zig-Tech shoes are crap -- so are any of the nike shox. These are shoes that are designed to look good, not perform well. I second Clint's suggestion. If you are going to be serious, then you must know what shoes fit your gate. There are a lot of good shoes out there, the one for you is a combo of function, fit and feel.
I am currently reading (and almost done with) a book called "Eat & Run", which is all about an Ultramarathon runner named Scott Jurek. Interestingly, he prefers to wear running flats (minimal support, like the NB Minimus and Nike Free mentioned earlier), even for 150 mile races. The idea behind these are that they use your FEET to run as we were created to be.
I believe Paleo also promotes bare foot running, etc, and these types of shoes are the closest to barefoot running (besides those monkey shoes) without actually running directly on the ground. They take some time to get used to but, in the end, allow your feet to strengthen and be used as they were intended to be used.
I think trail is right shoe for long distance running, you can have a look at this post about http://www.upere.com/fashion/what-type-of-shoes-is-suitable-for-wearing-for-cross-country/
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