hello mate. The M6 is not a good brake TBH. I found that the mini and M4 MONO are MUCH better. The M6 feels much more mushy, and wasnt as powerful, so i ditched mine.
I have some MINT mono M4's for sale if you need them? they are last years Gold and black ones which are MUCH nicer IMO. If you need any bits just ask, as im a mechanic in a bike shop and get staff discount.