I can't speak to the crossover update for the Lores, but I purchased the upgraded crossovers from Eric for the Pendragons and it is a substantial upgrade. I only installed the upgrade in one speaker so that I could do a direct comparison between the upgraded and stock versions. The upgrade was easily detected without any burn-in time. The new crossover provides much more upper end detail and presents a greater sense of 'air' around instruments and vocals. It is very cliche, but it really is as if you removed a veil from in front of the speaker.
It is a significant monetary investment, but I think the upgraded crossovers are well worth it on the Pendragons. And as has already been said, Eric is not making any money from the upgraded crossovers -- the Mundorf Caps are very expensive for the sizes required (8.2 and 10.0 uF for the Pendragons). You could probably save some money and use some different caps (Jantzen Superior Z caps or Mundorf Mcap Supremes), but the silver in oil are really special.