I have the Primo also. I bought it in Black. I love the sound. I replaced the stock 12AX7 also with a Tungsram from Upscale (Kevins stash). I replaced the stock 12AX7 before with a NOS Brimar. The Tungsram is so much better, it's like I added a subwoofer. Using Rega RS7s, great combo. Plenty of power for me, I can't even get close to half way.
I had a Plinius 9100 before, which I really liked. The Primo is much better. It's less powerful but has more/better bass.