SWF Kensai build?

[RoguemcStabby]

I have a twf center kensai, using rapiers as primary weapon.. I'm about to ETR get another 8 lvls, ETR then TR again.. the point is.. on my last epic life, I was considering reworking the build with SWF rather then TWF, all it would take is a readjustment of the feats...

Is there any harm going that route? was going to do it for fun more than anything..