Bought these to replace my worn out Asics 260 TR.  These are stiffer but not uncomfortable.  Very supportive too.  I wear these 3-6 times a week to the gym.  I do weight training along with elliptical, treadmill, and biking.  I'm not a class person so I can't comment on how they fare on wooden floors.  I am very happy with these.  I have a narrow foot and wear Superfeet orthotics and these fit perfectly.  These have great cushioning on the treadmill walking hills as well as no more numb toes on the elliptical.  No break in required.  These are great for lateral lunges and squats on the Bosu.  No more turned ankles!