Joining the fray... new but I've been lurking this particular thread for a month or two now while deliberating over getting this set
And.. it was delivered today. HL67A750. It's ridiculously huge, it almost seems like it's (impossible!) too big, it really dwarfs my two old 42" Westy LVM42W2, in size, features, color.. everything. PS3, X360, Dish HD - it all looks awesome on this set. It's stand is about the width of my last set. It's heavy, but not immovable. And it's absolutely silent, with the receiver muted I cannot tell the thing is actually on. SD content is actually acceptable looking on this set, more so than my old LCD. Blu-ray is incredible, I watched Hellboy all the way through and could not take my eyes off of the amount of additional detail this set seemed to bring to the party - I've had HD-DVD and Blu-Ray for quite some time and this is definitely much brighter, more crisp, and much more detailed than my old 1080p set even over the exact same cabling I used before.
It came with firmware 1006.1, which seems newer than anything else I see available for download. For grins I began the process to install 1005.3 and prompted me if I was sure I wanted to "upgrade" from 1006.1 to 1005.3, so it doesn't seem to verify that you're using something newer than what's already installed... but I did cancel it out for fear I'd cause more problems than I would fix.
So.. the "bad" stuff, although none of it is really a deal-breaker and would make me want to return it:
The set has shut off automatically at least once. While I doubt it was the dog or the cat stepping on the remote, it could have just been a fluke but thought it worth mentioning since I've seen that as a problem some feel is fixed by newer firmwares.
Xbox 360 @ 1080p over component goes bonkers, just like many have reported. Navigating to the display settings might cause a headache when trying to adjust it down, so you might want to just do that before hooking it up to "the Beast", or otherwise connect using VGA or HDMI.
USB support works well, but it doesn't seem to bring much power to the party - when I plugged a WD Passport (laptop drive) in, the set went into a power cycling frenzy which wouldn't stop until I pulled the plug. Once I plugged it back in with the drive still attached it had no complaints, and I was able to browse the pictures and music without any issues at all. I've had this happen twice so I'm guessing it's just meant for flash-based thumb drives and not drives requiring juice for moving parts.
It does seem to lack brightness in some areas, particularly in the corners when you're viewing it dead-on. It's not unbearable, and it could just be that this size set is really pushing the limits of the light engine behind it, it could just take some getting used to coming from experience with only CRT and LCD.
Anyhow, that's my spiel - I just wanted to drop some thoughts on the set since a lot of the posts on this thread are what helped support my desire to plunk down the cash for it. Thanks for being a great resource, and I hope to contribute if possible.