Anyone compared PL Dialogue 2 and Premium ?

I would like to know if anyone here has listened to the Dialogue 2 and the Dialogue Premium from PL. I'm familiar with the 2 which I owned about four years ago but never tried any other tubes besides the ones it came with. I would like to know if there is a perceived difference between these two integrated amps. I'm looking for a tube integrated that doesn't need biasing the tubes. Thanks in advance.