John,
I have been using a power feed on my mill for about the last year now. Mine is a large machine but the topic is still relevent.
I have found that my surface finishes have improved dramatically. Purely because you are getting a nice constant steady feed. No little 'dips' when you normally stop slightly to grab another handful of feed handle. Also you can concentrate more on keeping the cutter area cleaned and lubricated because both hands are free, again contributing to good surface finishes.
It really has transformed the way I work.
John