I have one. The only thing I would warn you about is that the " screw" they use to hold the arrow in place and also to set the straight/offset is not the best idea. You have to really torque it down to keep it from loosening on you. Glue doesn' t seem to stick to it much and it is very easy to use. It doesn' t take very long to have a dozen arrows done.
I have one and really like it. It was my dad' s and was made by Herters Inc. way back in the day (they have been around for over 30 years). It' s quick and easy to use.