I did - used it on my Sterling Grey Z4 - it came up lush after claying and some Swissvax :sweetheart:
I got a really bad skin reaction to the lube they supply though, so I used really well diluted Fairy in a water sprayer instead. I've never had any skin problems in the past, which did make me think twice about exactly what they put in it.
clay bars should all be the same. that said- i did buy a meguiars bar once years ago that smeared horribly, so I've stayed away from theirs since then. most likely it was just a fluke though.
but hmm...i should probably throw away my ~8 year old bottle of Erazer lube........