If you trim the rest according to the instructions on the CAP web site, the rest is much less trouble for your fletching. I don't cut the slots in like some do, but it works better when the back is trimmed flat. The type of fletch you use makes a difference too. Duravanes, AAE Speedflyte, and Bohning vanes hold up well to the biscuit. AAE Plastifletch Elite do not. Feathers work well too, the edges get a little "fuzzy", but hold up well otherwise and shoot great.

IMO, trimming the rest helps the accuracy somewhat.