These are helpful when wanting to clean up your bars and mount your shifter onto one clamp with the brake lever. They are secure, but can leave some heavy marks on carbon handlebars so make sure you check where you want them before cranking down on them.
MMX is a great addition for cleaning up the cockpit. I'm one of those "less is more" kind of guys and with this addition it cleans up the bike nice. I love that I no longer have to adjust two bar clamps with this and am less likely to break parts. If you don't have this you NEED it!
If running just a Sram shifter, the discrete clamp will do the job, but you are running Guide brakes with a Sram shifter, go with the MXX version which will put both shifter and brake on the same clamp.
I originally bought this for my new Pivot Mach 6 but found out during the building process that it was not needed. My SRAM X01 Shifter and Rock Shox Reverb Trigger attach easily to the Guide RSC Brake Levers for a super clean handlebar like Brett said below.
Feel free to contact me directly with any questions about setting up your bars. Kyle L. - Expert Gearhead - firstname.lastname@example.org - 801-736-4337