There are lots of factors to consider, just for conventional rollers. I can only speak from a sheetfed standpoint so here it goes: From my experience Botcher rollors print great but have a shorter livespan, about 25 million. Rotodyne print ok and have a long lifespan, about 50 million. Acorn printed great and we pushed them to 80 million before we replaced them, but they cost a fortune. Bingham never did run right, we had one unit and it didn't make it past 5 million. They were belled out when they were brand new. I don't even know if they are still around or not. Take into consideration the ink, paper, water, and solvents that you use. How often do they get washed up? Frequent washups can cut roller life in half. Do you use conditioner? Products like Febo clean can double roller life. Do you run lube on open units? Running a dry unit can destroy rollers in a week if it gets hot. Varnish is also hard on rollers. Let's say you have a 5 color press that always runs 4/c and varnish, I would buy some cheapo rollers for the varnish unit and apply the savings to get some better inkers. Buy in bulk to save money, as many units as you can at once and always order a full set when possible. If you find a brand and price you like, set up a contract to only use their rollers and they will lower the price even more. Don't forget, they need you to use their product and will make deals to make sure you do.