The only thing I heard and wouldn't like would be the more shifting. I'd call that hunting. Generally when a tranny i hunts like that the temp of the transmission goes up. I travel down the road with my 7000 pound coach and I'm is 6th most of the time @ 1600 rpm. If it shifts down to 5th the r's kick up to about 1800ish. if it drops to 4th it is certainly a real live hill and the r's go up to about 2400 and I will gaining speed real rapidly. I imagine if it was a 10 speed there'd just be some shift points between 4th and 6th to make the r's less depending on the incline. In my case I don't see why I'd need more speeds or power..........but then again I'm only hauling 7000 pounds ish.......kind of like having a dish towel behind the pickup.
2015 Creek Side 20fq, 450 Watts of Samlex Solar,
2013 GMC Denali, Duramax, Retired in 2021