First of all just generally. I'm only interested in the application to small GA aircraft. I attended a CASA presentation a few years ago when the outcome-based regulations a la EASA were promoted. At the time they said EASA didn't handle GA very well but they'd work on it. The draft regs and the MOS are not what I would call outcome-based - more prescriptive than currently, more effort required to comply so increased cost.
From friends who operate little aeroplanes in the UK, the more I hear of EASA the less I like it.