Can't comment on other mods, but, as I've noted in other posts, I've had the Jerry Ozment/Audio Logic tube output stage added to my unit, bypassing the Sony analog stage and its op-amps and power supplies, and am very pleased with the results. If you like the sound of the Audio Logic DAC, and Jerry is indeed doing these mods/bypass operations (he has vascillated on this in the past), it is worth considering. It is an excellent analog stage, using high quality parts, very musical, dynamic and detailed in my opinion. I'd still consider having him rig me an SACD digital out to run from the 777ES into my Audio Logic 2400, but that's gotta wait until they have an industry standard agreed for that interface; in the meantime this does very nicely. Hope to hear how the others like their mods--I would expect big improvements, as the analog stage of the 777 in particular can easily be improved on by a good designer not working to a price point.