I have had the AVR745 for a few weeks now, and I though I would give some impressions - this will be too short to be called a review, but I hope it is helpful.
My setup: Paradigm Studio 40 v3 (qty 3) for front left/center/right (acoustically transparent screen) ADP-470 v3 for sides (qty 2) and Studio 20 v2 (qty 2) for rears. Subs are SVS PC-Ultra (qty 2). Amps are Anthem MCA 20 for front left/right and MCA 5 Mark II for center/sides/rears. I use the AVR745 as a pre/pro, I don't use the amp section, and I do not use any of the video processing - I have a Lumagen HDQ for that.
I previously had a Lexicon DC-1 v4 DTS as my pre/pro, and all my comments are in reference to the performance of the DC1.
My reasons wanting the AVR745, and how happy I am with each:
1) Logic7 - mostly happy
2) Dual subs - very happy
3) Room EQ - very happy
4) Generally better sound due to newer DAC's , etc - very happy
5) HDMI audio from Toshiba HD-A1 - not happy
#1 - Logic7 - mostly happy - after having a Lexicon processor, I can't go with anything else than Logic7. I have had equipment myself and setup for friends that did PL IIxx and other formats (Circle surround, etc) but I can't get away from the right sound of Logic7. There is no substitute for me. The HK processors are missing some of the configuration options (dialog enhancement for example) that the Lexicon processors have, I assume that this is so that the HK receivers don't cannibalize sales of Lexicon equipment. After all, if you can get the same thing that a Lexicon MC-12 will do for much less money because it says Harmon Kardon instead of Lexicon on the front.
# 2 - dual subs - very happy - Two is better than one
Smother response across the entire seating area.
# 3 - Room EQ - very happy - this is one of the major reasons (other than Logic7) that I bought the 745. It works very well. I like it! My room is completely acoustically treated (except for bass traps, but due to my strange room geometry, bass trapping is not a necessity). Room EQ did exactly what it is advertised to do for my room.
#4 - Generally better sound due to newer DAC's , etc - very happy - Just replacing the DC1 with the 745 (no setup or eq) it was immediately apparent what 10 years of DAC improvements will do. Of course, you can get a better DAC from almost anything that is not junk these days - I got what I expected, a big improvement.
#5 - HDMI audio from Toshiba HD-A1 - not happy - as previous posters have stated, I can only get 2 channels (front left/right) from HDMI - hopefully HK will have a firmware fix for this soon.
I do not see any of the Quality Control issues (yet) that other have complained about - when power is removed from the 745 - I do not lose my settings, and I have no complaints about anything that does not work (other than the HDMI audio thing).
In conclusion - My options for Logic7 + HDMI audio were either a HK 645 or a 745 or a Lexicon MC-12 v5 + mic kit. I could not bring myself to spend the funds necessary for a Lexicon given what I could get from HK, so it was down to the 645 or the 745. I am glad I got the 745 and another SVS PC-Ultra. Time will tell on the HDMI audio issues. Hope this was helpful, glad to answer any questions.