Got Marantz sr 6006 few months ago, I dont think there is a big difference but I see the way they have described this new receiver by saying ADVANCE SOUND, I am not sure what does that mean as 6006 does have all those inputs to give a great sound. I got mine for $900 I am presuming that's a good deal. About the amp, its is just amazing, surround sound is too good to be true, I also love DTS music mode, every different mode they have given has some sort of special sound or you can hear there is a quite a difference between each other, love it, sound quality is very good, yes it is true that you will hear some of the missing sound instruments which you never hear before now you will hear, even on low volume, compared to my Harmon kardon entry level receiver I never used to hear those instruments noise, now i hear big big difference.
its better you print their operating manual, you have to read and do thing step by step,
the only thing i didn't like is if you wish to change the sound mode like gong from Dolby to dts which you cannot see on the receiver display, you have to switch on your tv to see that on the tv screen.As there are many different sound mode and you have see on the tv screen what you have choosen.
they could have also added night mode on the remote to use in the night time just like samsung tv remote gives you light to use in the night time,
also to mention you will see picture quality goes up or looks better when you play through the receiver.
I dont think any of the other brand can touch this one, like yamaha, denon, harmon kardon.if you want to spend more then move to McIntosh great for music not sure if they play surround