Jonathan, yes i do have the 48 and i love them to be honest, they are very comfortable. I don't get where the 37 came from, and by SGS do u mean the short cage or the long cage... it is a bit confusing i'm sorry. But thanks for the tip, it's amazing, i'm considering the SLX as well.

What about the cassette, should i go for an XT as well or are the SRAM cassettes more reliable, my current cassette is an SRAM, thanks