I've had both, started with a 990 but returned it because of the space issues due to it's size. I did experience some no audio issues with my 970 but it ended up being a bad capacitor which Outlaw fixed. After that no problems. I liked the analog bass management of the 970 as music is my first priority. I was really satisfied with the sound quality of the 970. I don't know at this point if I will wait for the 997 or buy another 970 or possibly a 990 (I have space for one now). I wouldn't hesitate on a 970 though, as Outlaw's customer service should you experience an issue is (in my experience) first class.