Fit is true to size based on running shoe size.  I would order them to fit tight if you are on the fence.  Nice smooth ride. Seems to be a neutral, minimal type shoe from the way my legs feel after running with them.  I haven't raced in them yet but the entry and exit is a breeze so I am sure they will shave a few seconds in transition.

very comfortable and lightweight. Great for working out or just lounging

These are very light and pretty comfortable especially for sockless wear.  I would not want to run much more than a 10K in them but they serve their purpose well.  Also I searched far and wide for these and this site by far had the best price.