I am absolutely loving my Maxx HD! I upgraded from original Maxx and at first wasn't sure the upgrade was worth me paying full retail (keeping my unlimited data FOREVER! LOL), but the more I use it the more and more I am liking it! Especially after going into stores and playing with the Galaxy S3 and the Note 2 ...
The new Snapdragon processor is noticeable right off the bat ... the device is extremely responsive and fluid. I haven't had any significant lag while using the device.
The on-screen soft keys are awesome and, IMO, are the only way ICS should be used. Before my first Maxx I came from GNex (great device, terrible phone in my experience) and the lacking on-screen navigation keys was the hardest adjustment for me. Believe it or not, the on-screen navigation was a huge factor in me upgrading ...
The screen itself is beautiful - it took me a while to appreciate it coming from my first Maxx, but again, it's one of those things where the more I play, the more I like
As far as connectivity - it has been flawless for me. I live in a heavily saturated 4G area and have not had a single hiccup ... WiFi to 4G handoffs are quick and seamless. Call quality has been superb - crystal clear without one dropped call thus far.
The battery is just plain insane! There's just no other way to explain it! I can get 1.5 days off one charge. Of course, everyone uses their phone different so results will vary, but if long battery life is a "must have" on your next device list, then the Maxx HD (IMO) is in a class of it's own!
Also, I think what Moto has done with Blur is awesome ... it's not intrusive at all while having some very nice, useful features. When I played with the SGS3 and the Note 2, the skin just seemed too cumbersome and appeared to completely overwrite the base Android OS. I had the GNex for about 8 months and I can say that the Maxx HD is very close to stock Android ... (the EXTREME amount of bloatware is ridiculous though! I think putting apps on a device that cannot be deleted should be illegal!! I just dropped $650 on this thing and have crap apps on here taking up space

... but, I digress ... this is another topic in and of itself)
There's my $0.02 .... hope it helps.
~~ Tapped from the 7th dimension~~