I've had other Birkenstock shoes forever and wanted to try the soft footbed.  To be honest, I can't tell much difference.  These are totally comfortable, but my old ones are too.  Probably the best thing is that since they adjust in two places (the straps), they can fit even when my feet are swollen.  I'm flying cross country in a couple days and will be wearing these on the plane because they are easy to slip into and will be comfortable even if my feet swell on the long flight. Since I'm only taking a carry-on, I can use these as slippers when in the motel and save space in my carry-on suitcase.  With airline prices so high for luggage, they're saving me money. Shoes/sandles that can be multipurpose are precious.