I'm not sure about the nomenclature behind markl mods, but if a LA5000 is the same thing as a markl modded D5000, I heard it at a meet and didn't like the experience. Here's my comments from the meet thread.
They are meet impressions so it's not 100% accurate, but these headphones didn't appear to me as refined or with a special characteristic that differentiates them from other dynamic headphones, other than a stupidly high price tag.