Yes, i did, and i still believe that the medium call in commanders will dominate the meta.
The reason they were so strong before is because you could use the fuel saved from not teching to spam the shit out of them, and if your opponent tech'd for his tanks he would be extremely far behind economically. I guess you could technically rush them in the new patch, but to be honest rushing an M5, T70, or a stuart would probably have a bigger impact. They come much, much earlier and leave much less room for error, considering there will be a lot less AT on the field to deal with them than by the time the medium call ins arrive.