MFM - I've added two actions to the poll, progressive action which is really not tip, mid or full.
Couple comments: I don't equate tip-flex to fast action. I also don't equate stiffness to fast action as many do. I might be all wet but I consider fast action the ability of the rod to generate high line speed with reasonable effort on the caster's behalf. This is a function of loading energy into a blank and unloading that energy when the stroke is abruptly stopped, not stiffness per se or the flex point near the top of the blank. If a rod is too stiff it won't load up and thus won't unload what it can't carry over to the forward stroke.
There is also traditional Spey vs. fast-action Spey, European style two-handers (overhead), etc. - different poll.