I'm driving 2 AE112 cabs with the LMIII and finding it a little lacking. I need to try the F500 one of these days.
Although I only have one AE112 now, my LMII/2-AE112 rig sounded great. Smooth, warm, punchy, and as much volume as I ever needed. I've heard some folks say that they preferred the sound of the LMII over the LMIII but I've never compared them side by side.