Anthony, thanks for the links.
I am aware of many “new” manufacturers and there are also many “old” proven ones such as Heliopan or Singh Ray. With those new kids on the block, we would need to have some time passing, in order to evaluate their true quality. Color consistence among the range, color persistence at different temperatures of atmosphere and light, and their steady performance over years of intensive use.
I do believe that new filters and technologies will come, but I will be much more cautious before I replace my LEE set.