Laura,
Personally, I wouldn't know the correct answer to this question (so of course I am not of use), but I do agree they are comfy. I just got my pair in today and used them with The Terminator (first section). I hardly felt any impact in my lower body (well a little because it is high intensity). I have used my other aerobic shoes for walking (also made by Ryka) and they feel fine. I guess it all depends on the shoe and the person wearing the shoe. Then again, I look forward to hearing Cathe's answer!