I have the exedy mach 600 with an upgraded clutch line. It ate the factory slave in 6 months, then in ate the master about a year later. Its also very heavy, which is ok until you get stuck in traffic for 8 hrs.
IMO I wish I just went with the exedy 500.
With this kind of thing you can either go stock, a little better than stock, or all the way the hell up like the RST or something. Most mid-pack options leave you wishing you had just done the RST in the first place.