My Buddy has 3 Mesa Dual Recto 212 side by side cabs. And I/we found them to be really beamy actually. If you are in the axis of the beam, fine. But when we walked out of the axis beam you could literally feel and hear the tone change as well as it getting quieter. But there are tons of peeps who really dig the Dual Recto cabs. The cabs I preferred for my Boogies back in the day were the upright 212s with the slanted top speakers, and the Theile single 12s. Not sure how they`d sound with the F12-X200s.
For my FM3, I am using the Xitone with Dayton Amp and the F12-X200. Off Axis sounds great. I am using only AustinBuddys Live Gold preset pack and hardly do any tweaking cept for maybe a bit of Variac and Power Supply.....