Just put on a pair of Emax after running Cobras for years, done about 3k miles so far and really like them. Cobras were great and I'm very happy with the Emax's so far.
If my experience is the same as most other report and I get better wear from the max's I'll probably stick with them.
Both are better then the Metz imo. The rears don't last and the fronts cup so badly you have to change them before they wear out anyway.
You certainly got everything you could out of your existing rear