My podiatrist recommended this exact shoe for my plantar fisciattis.  I really does help relieve the heal pain, but because of the different position and walking motion, it caused pain in my knee. I wear them for 1/2 a day and then switch over to other shoes.
I have wide feet, so they fit great in the width. I'd recommend heavier socks if your feet aren't wide. Be careful walking on any surface that isn't flat.  I'm a teacher, on my feet all day on tile covered concrete, and these shoes do help absorb the shock. I'm not wearing them to get in shape, just to relieve my feet. I'm not wearing them at home.