I also bought a pair of  MBT Shoes Chapa White   here on eBay.
The retail price I think is a bit high, but shopping ebay can get you a deal, I paid about half retail.

I really like them overall, very comfortable and seem to be well made.
Not that difficult to get used to, however, that may depend your your fitness level or balance.
There is a bit of "wobbliness" when you first put them on, but they are very springy and cushioning while walking and I got used to them pretty quick.

I don't know about the claims of a workout ...I wore them to the mall on day one and walked for 3 hours without soreness.
Again, this may have to do with fitness level, however, I work in an office and sit all day.
So this is the reason for the investment.

You can't really underscore the comfort of these shoes.
I did purchase a 1/2 size larger as suggested and they fit perfectly.

I do recommend MBT shoes and to shop around for them.

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