I went out and bought this blusher after seeing Sophie's post about it. I've been tempted for a while to go out and buy the NARS "Orgasm" blush, but the little voice inside my head keeps saying it's too expensive. As I don't own "Orgasm," I can't comment on the similarities, but looking at the images Sophie posted I'd say it's a pretty fantastic dupe, considering it's only £3.49 from Boots.
In terms of it's longevity, I took only this on my 4 day trip to Disneyland Paris at the beginning of the month, and it lasted the entire 17 hour coach journey as well as two full days I spent in Disneyland, so it wears pretty well without having to top it up as the day goes on.
The blusher does have a shimmer to it, but I'd say it's quite subtle. It's also pretty high on the pigment scale for such a cheap product, and blends very easily. I'd definitely recommend for anyone on a budget!