i havent heard a single good sound, maybe im way too used to a four twelve cab .
Then something is not setup right. Maybe you should open up a support ticket.
My Kemper sounds bigger and better than any amp I have ever used. Marshal, Mesa Boogie, Fender, Peavey, Randall and many more. I have used so many great amps and with my Kemper Stage I feel like I still do.
I believe the reason you haven't heard a single good sound is because you don't have it figured out yet. Just listen to the Kemper stuff on you tube and believe me it sounds better live.
If you still don't like the sound others are getting just sell it. Many professional/amateur musicians would love own your setup and its Christmas so its a good time to sell.