I have a pair of MBTs I got on ebay and they are alright as long as I'm walking. They are awful to stand in.
I also have a pair of these horrible looking things I got from Avon. I wear them all summer unless I have to look decent.
They are super comfy and don't irritate my Plantar fasciitis. I don't care that much about toning, though I probably should, but I don't like pain.