I am a new runner who started running 5k, 10k and a 10 mile in 2008-09. Started with Asics and didn't know much about running shoes but kept looking for great deals. After all, I used Saucony and Nike for a while. Also, my Achilles tendon and knees hurt for a long time. Eventually went and tried it on at a running store and they recommended the Asics Gel Nimbus - pricey but supple. Over time I developed severe pain in my knees and eventually I turned to an orthopedist for advice. The Gel Nimbus turned out to be too soft, especially in the heel area for my running gait. It also turns out that one leg is 3/8 inch shorter than the other, which is the number one cause of knee pain. The podiatrist provided a list of matching shoes, including the GT-2140, which he says will be firmer in the heel. He also provided a 3/8 inch instep which he felt needed to be placed under the sole of the shoe on the shorter foot. The GT-2140 has completely changed my running experience. They are firm but offer the right level of support for my gait. Best of all I'm running more or less pain free and there's nothing like that after gritting my teeth for a year once I get 4 miles and moving forward. I am currently training for a marathon and have covered 150 miles in these shoes in the last 7 weeks and they are holding up well. I heard they will be discontinued soon so I have a feeling I'll be buying at least two more pairs before that happens! Highly recommend this shoe for runners who don't overpronate but need stability and a firmer heel.