I have been wearing this style for 4 years. I have purchased my second pair in the last year due to I wore these shoes 5 days a week for 2 years and they just word down.  The only weakness is the buckle.  The buckle is padded and is more comfortable than the Sirima version which is velcro which is NOT padded.  The buckle is sewn with a heavy elastic but that elastic wears down after a few months depending on the pressure and how you walk.  On mine, only one shoe (left foot) the elastic had to be repaired by a shoe repair place but I never saw this as a deterrent from buying my second pair.  I liked the fact that by wearing this shoe it did the following:
1. In only 4 months, both heel spurs were healed.  I walked on a hard floor surface in my job for 6 hour shifts.
2. The way the shoe is made, it has the floating bottom or shape up type that causes less pressure on heels. It has the rocker motion and it not only feels good once you get used to it, it decreased pain and fatigue and allowed me to be on my feet longer without pain.  My husband, age 62 and a nurse working 12 hours shifts loves MBT shoes as well.
3. This style is leather throughout the shoe and allows your foot to breath. I have worn these shoes on long flights and working for an airline, spent many hours in airports in these shoes all day without foot fatigue. I feel like an evangelist whenever I tell people about these shoes.