Gevenalle's shifters and RDs are based on Microshift, then upgraded. The quality of microshift's stuff is very good. My son is rolling a Forte brand RD (built by Microshift) that has my ultegra pulleys from an RD I blew out racing cyclocross.
My cyclocross rig has Gevenalle shifters and the BURD (Blatantly upgraded rear derailleur) and the setup has been flawless, even though it has been put through two full seasons of PNW cyclocross hell.