Well, I still have my original RPX-33, customized a little bit, black velvet pot, custom case, etc...basically same topology. And I recently got the Massdrop Fostex headphones, after all these fuss in head-fi, and specially the review by Jude, and following the recommendation of markl, which I somewhat trust, (as the R-10 was a common denominator as the reference headphone for both for long time). And I got all of them, the three models, and honestly I sold my Editions 9, and probably the rest....there is absolutely nothing that I will look for in headphones anymore, those headphones simply rock....
Now about the mods, sorry guys, but I'm still wondering why the hell people need to modify a wonderful sounding headphone, and get into something, that unless they have heard the modded ones, may or not improve the sound to your liking.
Not sure what people need to improve on the R-10, or these Fostex?...Honestly I'm very happy with them the way they sound.