I really love the SQ of the A970 that I sold my E12 because I hardly use it anymore. I run it with a Note 2 with ArmAmp (crossfeed on) / Denon / Noozy players with Nooxzoide app to replace the default DSP > USB OTG > E17 > A970 amp.
I find the sound impressive though bulky as three boxes are stacked up together, but that never bothered me as I always carry a bag. The amp alone with the given DAP configuration has this airy and large soundstage, resolution and detail is definitely better than E12 (specially the SOUNDSTAGE). It also has a slight bump on the Mid-bass region, decay is better than any Fiio amp I've tried. and overall has a warm presentation (a little wee bit slower than E17's amp section as far as I can remember). Pairing it with a E17 assist in the amp department, driving almost all my HPs and gives more detail, separation, soundstage and positioning, it's very much transparent for me.
To me it was a gear for the long run...until it was stolen. lol
P.S.
That set-up has been driving my PortaPro, Yamaha HPE-160, Audio Technica WS55/702, SR80, Sennheiser 555/518/429 with ease.