These were all great amps. I owned an ML-2, ML-3 and No 23.5 in the mid 80's. I started with an ML-2 but I was driving Magneplaner Tympani-IVs in a very large room. At low volumes, it was absolutely exquisite, but it ran out of power at louder volumes, and since I was in my 20s then, I liked to crank them louder than I should have. I switched to an ML-3 which had tons of grunt. When I sold my Tympani IVs and switched to Duntech Sovereigns, I also traded in my ML-3 for a No 23.5, which I agree was more refined. But these were all great amps in their day, and I think the ML-2 and No 23.5 could still hold their own against current amps (at least under $20K).