XPro1 And 100-400 Experiences

I see that Fuji will be putting the 100-400 + TC on sale for $1999 in the US and am considering pulling the trigger on it. I've upgraded my XP1 to the newest firmware for the 100-400 and would like to hear from those of you who own the 100-400 and use it on the XP1. I've already read about using it on the XP2 and have no interest at this point in upgrading to the XP2 so please keep responses to using the XP1 with the 100-400 and with the TC.
Thanks!