I am using both sensei 4 and 5. I feel 4 is much better.  I gave 2 star for the following reasons -<br /><br />1. No cushion on the upper part. I think this is a major design flaw. It hurts when I tighten the lace.<br />2. It does't fit as good as sensei 4, may be because of there is practically no padding on the tongue. I need to buy tongue padding if I find it somewhere.<br />3. Less lateral stability compared to sensei 4<br />4. Sometime I feel too much cushioning as the bottom. I wouldn't have felt it, if there was some of that on the tongue.<br />I have been using Asics for 7 yrs. Hope Asics comes with a real-upgrade or else it becoming very confusing.