I have a D3, an Opemus III, and a old Federal Stowaway, the Stowaway is a diffusion 6X9 while the D3 and Opemus have the condenser heads. I bought the 6X7 for the color head. I normally have a 2 enlarger set up so I can work on 2 negatives at the same time, and I have decades of color negatives I wanted to sort through and print, vast majority 35mmr the 6700 would have worked just fine. I like the Opemus for black and white. The Federal has a double lens, not interchangable, creates a soft look, very nice with the right negative. Maybe I'll see if I can run down a color head for the Opemus. Or pull out my color filter kit and print on the D3. Can be done, just a pain the rear getting the filter pack just right.