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Jools has been running a set for about a year without any issues. I've ordered a set for myself, as my own discs are probably very close to the wear limit after 35k miles, and I need new pads anyway, so best change both at the same time.
They seem to make very good sense if you need to replace them anyway, as they are considerably cheaper than the OEM Brembo's.
I've just gone for the grooved one, as I couldn't justify the extra for the ones with separate alloy bells on at the moment.