Had new one in R72 this fall - corn_beans only - worked perfect. Makes a good combine into a great combine. I know someone who ran wet tough rye through the Sunnybrook Gen.II last summer and said it worked great.
Seems like they work great. Increase capacity, it seems as though there is a better transistion and certainly does a good job in small grains. In some cases you may want to run a couple of reverse bars. Running it with a fine cut chopper kit seems to be a good combination, avoiding the bottle neck at the chopper.
I try to stay out of the small wet grain but sometimes it does get tough. Anyway, the generation 2 will handle those conditions better than original equipment. Takes a little less power and you will here a lot less rumbling. In fact, I don't believe I have ever heard this rotor rumble. I think the transition area to the discharge is where that rumbling occurs and with the design of this rotor it will virtually eliminate the rumbling.