Audiocraft AC3300 / 4400 experiences

I just came into possession of the AC-4400 tonearm with the S-shaped MC-400 12" armpipe and associated counter weights for heavy carts of the low output low compliance type, which is my kind of type!
It comes with the light armbase LB-250, which means I will need to get three holes drilled on my Micro AX-6G to be able to install it. This will take me some time, but in anticipation I’d appreciate some feedback from people actually using this arm. It will replace an AC-4000 in my system, which I have come to like very much. But the 4400 is supposed to be much better. Anyone who made that comparison?