I have a Pheer 427 and love it. The main difference in the 454 are a few nice upgrades. The flat platen tilts on the 454 and does not on the 427. Also the motor bolts directly to the grinder frame...the 427 does not, so you have a little more self setup involved. I went with the 427 about a year ago with 1.5hp motor, variable speed and have been completely satisfied. Jose was really awesome to work with, highly recommended.
I have since upgraded to a 5in drive wheel, adjustable workrest, and built a tilting frame...so it has been very adaptable