Had my first hit with both of these strings and really like them so far.

Initial impressions:

- Both sound fantastic and are highly textured. They are.on the harder side but not too hard.

- 66 is very well rounded. It has great power, control, repulsion, spin, net play. It does everything well. It feels a bit beefier than your usual .65mm string. Slices are amazing with the grip.

- 63 has power very close to ex63, where it beats ex63 is on spin and net control (which is my only issue with ex63). A bit more repulsion than em66, so a little harder to control but more fun

Quite impressed with both and def worth a try.

Has anyone else used these yet?