This is the first pair of ASICS I have ever owned so I was taking a chance
on the size. I went up a half size and they fit perfectly!!! There was no break-in period...
I put them on and wore them all day long. The colors on the laces,the upper shoe and the soles make me smile whenever
I l;ook down at them.  In the past I have mostly worn RYKAS and NIKES,but I think my next pair ordered will
be another pair of ASICS. Oh!!! Did I mention how light they are???? All in all I am extremely happy with my purchase. If you are undecided-----go for it. They are great.