I don't think you will find anyone, anywhere in the world, who has owned the Ultimate preamplifier, that would have anything "negative", to report. This preamplifier does everything not just correct, but just about perfectly. personally, I have owned a few of these, and I have compared the two other preamps. Sonically, just incredible. The cosmetics, would be a matter of personal taste, and some would say could definitely use design improvement, But that has nothing to do with sound. You can't go wrong buying the "ultimate". NOS driver tubes alter the sound tremendously, It's a tweaks delight!
The LAMM L1, Is also a spectacular preamplifier. Clean, clear, and precise and yet very musical. Absolutely a winner. And the support direct from the manufacturer is second to none. A great guy, and will walk you step-by-step through the preamplifier himself.
I hope this helps…