Hello.
This may be out of interest since the Kone and the cab are already here, but I recently brought my 108 home from the rehearsal room and I've been checking it against the Yamaha face to face.
Yamaha wins no doubt. It's much more clear, clean and had better dinamics.
The 108 sounds more compressed, distorted, and it hasn't that clarity. It also has that bass presence... Maybe it's great for metal players or for others, but not for me.
I know with such a different price tag they are in different worlds.
Anyway the 108 sounds great for the price and is very handy. If I had to buy one today for rehearsals and playing at home I'd get the 108.
But, for me, the Yamaha's sound quality is simply better.