I had the III (and the II) man are they a pain to lug around. If you actively gig these are no fun to haul around, mind you, you need a rack and it will also not be light. I love the FM3, I got a 32" pedaltrain board that weighs 1 lb and comes with a really nice case that everything I need fits into. I put all my exp pedals/volume pedals on the board and a few other things and it all fits into a case I can carry
This holds my FM3, 2 expression pedals and a volume pedal, a Radial Big Shot, an Electro Harmonix K9 pedal, a Morley ABC switcher and a
Tripp-Lite 8 outlet isobar for power. Also in the case I throw all the cables, a bag for accessories and a small 4 channel mixer as I run 3 outputs. I can set up or pack up the whole thing in a few minutes.