Haha, well, as long as you're hasted, the movement speed loss is negligible. Not to mention you're probably still moving faster than others due to Monk class feats. Not sure there, though.
But, Vorpal Strikes.. yeah. I don't know how much use it would be in (some) EH content, and probably all EE content. Compared to something else (Imp. Martial Arts for example, or the past life feat), I'm not sure it's worth it at this point. However, this still leaves one wondering.. how much STR is really necessary? Obviously you still want SF, QP, and other Monk abilities to land. Is your WIS modifier going to be gimped if you pump your STR instead of putting some in to WIS?
Yeah, I know SF and others aren't going to work on bosses, and a lot of reds (especially new ones), but that doesn't mean one should ignore them, given their uses on non-boss NPCs.
But those, too; how useful are they in EE content? I know SF and QP probably lands frequently with 50-ish saves in EH, but what about EE?
Monks have too much to juggle. :/