I haven't used the magsticks before, but I have noticed that fighters are much easier/better on a stick with a long throw. I also found that the long throw makes 4-way games more playable than they are with a short throw 8-way. I have some wico microswitch sticks on my cab now and find them much more fighter friendly than the "Omni-stick basics" (aka something else, but I don't remember what) I started out with.
My cabinet is too narrow for a 3rd stick to be added so I would like to find a long-throw switch-from-above solution too. While some 4-way games like Klax, Frogger, and even Pac-Man are OK with the long 8-way, one of my new favorites Burgertime is no good at all.
I'm keeping my eye out, and if I find nothing I may make some top mounted restrictor plates.