Can't comment on the Reebok Easytones as have no experience on them, but I have been a fan of MBTs for about four years now and wouldn't give them up for anything.
They are a bit on the pricey side starting at around £120 depending on the model (though you do sometimes get them in the sales too so it's good to shop around), but my first pair of sport blacks lasted me a good few years, so I feel I got my money's worth using them all year round, and I'm onto my second pair now. I can definitely tell when I've been walking in the MBTs instead of other shoes, as the muscles on my legs definitely feel like they've had more of a work out, and what's best, they are really comfy to wear too. I've now got my husband, sister, mom, and a few friends onto them, and they've all been very happy with them, so I really can't recommend them highly enough.
Hope this helps