Ok,..I've played through two Dr Z amps in my life,..a Rt 66 and yesterday a Perscription ES, and I must say each time I was floored at how pure and complex the tone is. I used a 61 RI SG through the Perscription into a Z-Best 2x12 (V30/GB mix) and tried a BB preamp by Xotic Effects into it,....seriously, I was blown away. All the amps I own are high gain monsters, but I also love great, spanky cleans and vintage overdrive ala Jimi, Zep, Black Crowes, Pearl Jam, etc. So,.....I want a Dr Z, just have to figure out which one is for me. The setup would be to set the amp for a great clean tone and use pedals for overdrive. Out of the descriptions I think the KT-45 would be the one for me,.....I'm going over to a friends place this week to play through his, so we'll see. Any knowledge you have to pass on regarding Dr Z amps please share.