As happy as I am with the TH 900's, I went ahead and purchased Lawton Mods for them. They made an incredible difference in my AH-D7000's and, if the difference is similar in the TH 900's, I think I will be very pleased. The big question for me is the how the bass will sound of course, as is with most people. The LA-D 7000 Lite had bass quantity and properties very similar to that of the TH 900 stock, and maybe that is the sweet spot for me. But sometimes, you just have to make the jump and trust that it's the right decision for you, and I believe most of the Lawton improvements will be welcome changes to the stock TH 900, especially in sound stage, treble harshness, and mids. Please understand for people who want to do this, it will most likely decrease the resale value of these phones in a negative way (and also voids warranty), but if trying to find your perfect sound is the true pursuit, then to me the mods are at least worth trying. After all, nobody gets into this hobby and expects to keep their wallet intact! I will be happy to share my opinions of post mod effects on the SQ after the mods are completed.