Earlier this year I redesigned my business cards. I don't use then very often but they do come in handy now and then. The old ones were a stale design, they needed an update and more modern cleaner look. The new design I really liked... until they arrived in the mail and I knew I made a serious mistake. They were far too dark and not easy enough to read.
Things can look great on your 17" RGB 5K monitor but when printed on paper in CYMK on paper the ink can absorb and diffuse the colours, muddying them. Contrast is your friend in print projects unless obscuring details is part of the design. I didn't even dislike them, but i knew they were not going to get attention or even read because of the lack of contrast.
So lesson learned/relearned and I kept much the same design look but made sure all the information was readable from a distance and clear. Before they were black on dark grey and now the logo stands out and I added my phone number back in. I don't really want to be called on the phone and prefer email but having phone number lends more credence to me being a real business.