I own a reference7.1 modified with the usb32 chip. Yesterday I installed the firmware and driver 2014.
The sound is really different, more 3D; treble and medium are more "present" and up front and the bass is lower than with the driver 2.0, but more precis and faster.
Personally, last year I choose for the Audio-GD Reference7.1 with USB32 chip because I like the "sweet and warm sound" (that are not the only qualities of this unit).
So, really, I'm not sure sure I prefer the driver 2014 .... Yes sonically it is superior, better medium, faster bass ... but personnally I miss "something" in the sound, something I have with the driver2.0. I have the impression that the driver 2.0 is more "analog sound"
This is really a question of personal taste and I have to listen more, but I guess I prefer the driver 2.0 because it is sweeter and warmer and this is something I like.
By the way, I use JPLAY5.2, and kernell streaming.