It's weird, because many are saying the opposite...
BTW, missed chatting with you during the days of AVS...
Right -- this is the dilemma I am stuck in, because we only would need a new AVR if the HDMI out on our current one is bad (because I need it to double-check settings from time to time; it doesn't pass 4K video, so I'm obviously not using it for that), but we'd also need a new one if/when we add either Atmos ceiling speakers or the front modules.
Otherwise, the 605 is doing just fine for our needs.
You haven't moved to a 4K display yet?
I moved to 4K, adding a Samsung UHD TV and Panasonic UHD Blu-ray player, but I didn't have to give up my old AVR because the Blu-ray player has dual HDMI outs, so I can run one to the display directly for video and the other to my older Onkyo for bitstreaming the "older" codecs like TrueHD and Master Audio.
Well, if it does what's being described here -- basically "guessing" at where dialogue should go in an overhead Atmos-enabled space (unless I am not understanding how it works) -- I don't know if I'd personally call it "good."
I BELIEVE -- but can't be 100-percent certain -- that my unit DOES allow you to apply DTS Neo:6 (which is like DTS' answer to Dolby's Pro Logic) processing to Dolby-encoded sources. I never used the DTS modes with two-channel soundtracks, instead always relying on Dolby Pro Logic II Movie mode, but I know there is a music-oriented mode for Neo:6, much like Pro Logic II Music...