I received these shoes 3 days ago and have worn them twice to the Gym.  They were comfortable right out of the box.  I didn't need a break-in period or time to get use to walking in them as I had purchased a pair of Chung shi shoes last year (which are similar) but not as good.  The MBT's are much more supportive and have better cushioning.  I work out 3-4 times per week and use these shoes on the treadmill and elliptical machines.  I have a wide foot and a bunion and this shoe accommodates my foot condition very well.  I plan to order a 2nd pair so I can alternate them.  Oh, I don't want to forget to mention what a great price I received from Amazon and the fast shipping.  I received them in 2 days from the time I ordered them.  Even though I have only worn them for a short period of time, I believe they are perfect for me.  I highly recommend them especially if you have a wide foot.  I normally wear a size 9 shoe but I ordered the 9 1/2.

Thank you.