Hi BBB,
No the 2113 isnt my first receiver. I had a Sony STR-DB925 from the early days of Dolby Digital, when all multi channel amps had the obligatory blue LED, to signify the 5.1 input.
I was always very happy with it, and only decided to change when I renovated the lounge and put the TV on the wall. My biggest reason for changing was for the HDMI switching and ARC, but now I have it, the difference is remarkable, I'd even go as far as to say that the DTS Neo 6 processing actually sounds better than the true 5.1 did on the Sony.
Musically I have always liked the Denon sound, and for music the 2113 blows my old Sony completely out of the water. Add in the network features inc. Spotify, ease of use, and for me it makes for a great all round system.