I honestly think THX's only real usefulness on the home front, at this point, is that they make really cool sounding trailers. THX certified equipment really isn't, and hasn't been for awhile, any better than stuff that ISN'T THX Certified. That's not to say THX is slacking, but that manufacturers have improved their product so much that a VERY large percentage of the mid-to-high end equipment is way better than even the high end stuff was just a few short years ago.
but the THX Theater Alignment Program IS still top notch, and I wish there were more programs similar to it. maybe we'd get a better chance at a good theatrical presentation if it was like that. As it stands now, TAP is spread too thin, and theater owners are settling for the most MEDIOCRE showing they can. Which keeps me at home more often than not, anymore.