i love my vertical shooters, but i also really enjoy horizontal fighters..
As an owner of a rotating monitor cab let me offer you another perspective.
first , your going to need two frontends..
one for vertical and one for horizontal..for verticals your going to need a fronted like vertimame so that you can even load a game without breaking your neck.. configuring and running two frontends is a real pain...
also,each time you rotate your monitor ,your going to need to rotate a bezel with it,which for my cab at least is a pain in the rear. in addition you will need to readjust your monitors settings to accomodate the different aspect ratio, and depending on how accesible your monitor controls are, can pose a problem (if they are in the rear, you will need two people to adjust the monitor, one in the rear to tweak and one to watch in up front)
if i were to do it all lover again. i would likely have bought a dedicated horizontal and a dedicate vertical cab..
this way theres no need to fidjet with this and that and jump back and forth between frontends. just move two steps to the left and play cab 2
