Hello bussy.
I'm afraid I sold my LA610 some months ago. If you want to listen to some demos I'v done with the GTQC you can check out this page :
NRK Urørt - CD
I can tell you this much that the reason I sold the LA610 is the lack of headroom with my high output condenser microphone Neumann U87ai.
Another reason was to get money to buy the Neumann M149 tube microphone.
Aurora GTQC is a keeper. I like it very much. With the GTQC you have lot's of options sculpting the sound with HPF, EQ and compressor.
It would be cool if it had spdif or adat, but other than that I think it's great.