I'd have to agree with Charlest. Still using 8-10 year old L/LM equipment that rolls and hits as good as the day I bought them.
But is that the current Lane Masters or the original one? Even the last couple of years of product before the original Lane Masters went bankrupt, those balls were not near as durable as the ones being poured prior to 2010.
I haven't used the original LM balls with filler nearly as much as I used the ones without filler; so I'm not as sure about balls like the Sure Strike and the XS Power as I am about the ones like New Standard, Yeah Baby, World Class, Big Bang, Masterpiece, Kong and Buzz.
So far with the new LM, I have the Perfect, Terminator and Red Diamond. So far, no loss of performance but it's a long way from "these are the most durable."