Be aware on this, we have been using this for over a year and the pit falls are. The percentage coverage is based on overall coverage not per toner, the biggest thing is the cost you offer it at, if 30% is in 0-5, 30% in the 6-10 and the 60% is above. What we have found is that the 60% and above is not just 11% coverage but 20-30%, so your copy cost doesnt cover this cost and you could lose money on the high end copy cost. The two lower tiers make you money but your margins are lower as 60% mark up on a low copy cost doesnt cover the loses in the high end, so the net effect is you can loose money, unless you offer a high top end cost per copy. But then the question is if I was offering a low flat rate cost per copy, why would i opt for a tierd system that has a higher top end, but then I will make more money on the low end. Less hassle. The only thing i have seen done, is that the dealer goes in and adjusts the % to ensure all colour is in the high end and customer not aware.