I just purchased the Skecher xf dash sandals....here are my observations:
* Just as several folks stated, these sandals do run a bit large/long but not overly so. I usually wear size 7 1/2 in sneakers, and size 7 in sandals. I purchased the xf dash in size 7. There is 1/2 inch room from my heel to back of sandal, and another 1/2 inch room from my big toe to top of sandal. If you like to have sandals with your foot resting in the middle of the shoe then normal size is fine. If you like your foot to be more toward the top & bottom edges of the shoe, then you would want to go 1/2 size smaller.
* I have to admit these are the most comfortable sandals that I now have - they are like walking on pillows. I've walked around with in the house - 1 foot wearing the Skecher xf dash, other foot wearing other comfortable sandals I have (Ecco, Aravon by New Balance, etc). The Skecher xf dash is much more cushiony, and has a smoother walk since it has the rocker bottoms.
* The Skecher xf dash look more like normal sandals than other rocker designed shoes (which tend to look more ortheopetic). I didn't buy the Skecher sneakers (I went with the New Balance Rock N Tones instead, which are not as thick on the bottom. Reebok also makes the Easy/SimpleTones, but they don't offer the same rocking motion as Skecher, New Balance, etc). I don't personally like wearing flip flops - which most of the rocker sandals are; so these sandals worked out perfectly for me by having a more traditional sandal style with back strap.
Overall, I would say this was a great buy! I've only worn them in the house to be sure I want to keep them, so will now need to test them on longer / real walk to see how my feet feel.
I say go for it!