After years of trying different types of running shoes to get back to regular exercise, and finding all manner of bio-mechanical issues along the way, I have finally found a shoe that allows running without pain in my shins and plantar fascia. I have recently tried shoes like the Kinvara 2 and two variations of Nike Free, all of which have a 4-5 mm drop from toe to heel. This allows an easing into the barefoot running style. The Kinvara 3 are my favorite!
PRO:
-extremely lightweight
-comfortable from the start
-roomier toe-box than the Kinvara 2
CON:
-I personally like the colors and design, but you may not. To each his own!
-for functionality, it is hard to find a CON

I now run pain-free 15-20 miles a week. I followed others' advice about easing into this style of running shoe: you will be more on your toes, or do more of a flat strike than the rocking heel to toe motion of traditional shoes with their higher heel to toe drop. I initially felt more of a workout for my calf and quadricep muscles but after a month, am now acclimated to the running style. The best part: no shin splints and no debilitating pain from my arches!
I am not racing and certainly would get passed by others who are more fleet-footed, but I am running in these Kinvara 3's to lose weight (20+ lbs in 5 months) and get healthier. I started in Nike Free shoes and now alternate between them and these Kinvara 3's. I find myself picking up the Kinvaras more often.
Whatever your reasons for trying these shoes, I send my best wishes for pain-free running and better health!