I just made the switch from the Nike Lunar Vapor Tours to the Asics Gel Challenger 7s. I had to return the Vapors due to the upper separating from the sole (just as other TTers have reported) I could not be happier with the switch! I only play on hardcourts and the Asics are more comfortable and easier on my feet and knees than the Vapors. It required almost no break-in, I just walked around my house for 5 minutes with them on before hitting the courts. I'm so glad TW offers a 6 month durability guarantee on almost all Asics shoes now, becuase I'll be sticking with Asics for a while. My shoe history: Vapor 4, 6, and 7. Courtballistec 1.3. Barricade 5. Adidas Ultimate Edge. Side note: it may just be me, but the Challengers have a Vapor-like look when I look down on them.