Gene while these tips do have inconsistencies, if you own a Durameter type C the good can easily be separated from the Bad. Now, when all is said and done, I may throw away between 10 and 20 tips out of a box of 50. But, the instalation price I charge $10 per tip, more than makes up for the tips disposed of.
Gene with a Durometer Lepro Tips can be broken down into Med, Med Hard, and hard, and this allows you give your customer what they want without guessing.
Check out my post on page 3 in the thread below where I go into more detail.
http://forums.azbilliards.com/showthread.php?t=96211&page=3
Now, layered tips including Moori tips are not perfect. They also have problems, and they are also not always the hardness that is maked on them, just like Lepro tips. The only difference being the cost of the tips which is greatly different. Now do not get me wrong, I have around 20 different types of tips in my inventory, I tip a large number of cues monthly. With this said, first I recommend that anyone who replaces a large number of tips should by a Durometer. Without one, the tips you install can not be gaged for their individual quality, and in my opinion any professional would want to give his customers the best service he is capable of providing.