imho, after testing two out, it's very very limiting and not at all feather friendly.
while there are legions of folks who swear by the bitz (and i was one, for sure), and after personally having and using a half dozen since the 60's, imo it's just too overpriced and in the long run not as durable as even the cheapest polycarb fletchers that won't rust/corrode.
imo, the best bang-for-the buck polycarb is still the grayling for $30, and outta the chute it'll do both three and four fletch as accurately as any bitz - i did the testing, lots and lots of testing. i use one for four fletching carbons with 4.25" left offset 'naners.
next up is the bohning pro for $30, but it won't do four fletch - i use one for all my woodies, set with a heavy left wing helical and 5.25" burnt feathers.
as always, YMMV.
:D