I have found the top to be so comfortable that I am wearing a half size smaller shoe to give me a good snug fit and better power transfer. The harness system (very similar to my old Adidas Adistar shoes) is excellent. The top strap has ratchet adjustment for ease of use on the fly and the bottom two steps are fool proof velco. Another handy addition is the supplied brass plates that sit between the cleat and the solo. There is two different thicknesses to suit all pedals and give a perfect connection. They also act as protection against wear on you sole from rubbing on the outside of the pedal (especially good for egg better uses). Bottom line is these shoe a great. They have everything you would want in a race shoe or even an all day trail shoe. I even think I will stop taking a second set of shoes to races they are that good. I forgot to mention they are light, very light.
I would also like to touch on the Zxellium Road shoes also. These are not for the person who doesn't want to be noticed (I believe the yellow version is only a limited edition, there are also some more subtle models available in the Mavic like up). I have never used a product that has drawn as much attention as these shoes. I have found them to be as comfortable as the mtb shoes. The are stiff, light and seem to have a great power transfer. All day rides on the road bike now give me no foot discomfort whatsoever.