Hi Trin, I have worn MBTs most days for the past 2 yrs. overall, very comfy and a re-education of walking style. do they do what it 'says on the tin'? don't know, jury is still out. will I buy another pair? again, unsure. they've lasted well, much longer than normal shoes, but....... I dunno.
probably not that helpful but, as you say, they are expensive. when I went to look at the shoes, the sales staff were very good and not 'pushy'. spent about 2 hrs in the shop discussing the merits, using a treadmill, learning the 'new way to walk'. trying all the styles of shoe. so, maybe head over to a specialist stockist and see how you get on with them.