I have just bought my first pair. I have v wide feet but they fit fine in my usual size. I was hesitant as they get quite a bashing but oh my! So comfortable. Best buy in ages. And I'm sure they won't last longer than one summer but then nor do lots of shoes (converse, wellies etc). Am happy!
On the contrary, I have a pair I bought in 2008 that still do the job. They're fabulously comfy and have a little bit of arch support that makes them better than your average summer shoe. And the charity angle appeals to me- I get very judgy when I see people in faux-Toms. They're depriving a needy child of shoes!
I have three pairs plus a pair of cork wedges which are the comfiest pair of heels I've ever worn.