I've had my P600 for only 3 weeks. For that short amount of time I haven't noticed that is uses ink while idle - but what it surely does is drink ink when you swap between photo and matte black. I've already learned to keep that to a minimum. I'm using Exhibition Fiber for B&W, not just because its a great paper for the purpose, but also because it prints with the photo black cartridge. I have a real love for the Velvet Fine art paper, but the idea of the printer discharging 3 ml of ink in the swap doesn't fly well with me. Clogging hasn't been a problem here in Sacramento (a fairly dry place), but I tend to print something almost on a daily basis.
