Primarily laptop. I've got a couple Mac Minis, though one is for the kids and the other is in the storage with the calibrated monitors, pending a move at indefinite date, so right now, crappy laptop monitor. When they weren't packed up, i'd use the calibrated external monitor with either. I tried using the Mac with DPP and Adobe lightroom, though I didn't like the version they had released at the time for DPP on the Mac, found setting the printing options confusing. Lightroom seemed easy, though I couldn't do exactly what I wanted to do, but most things did look 'good'. This isn't a Mac/PC issue, but rather a software issue. I'll get back to the Mac Mini when it's time to unpack, install the latest version of DPP, which is supposed to be identical to the PC version, and I'm hoping things will be different then.