I purchased a used Green 2003 Simplicty (Ferris) Derby with 220 hours on it last week for $3500. I got verification from the VP of Engineering at Simplicity that it is "basically a true commercial unit with some minor tweaks to make it more consumer friendly." I have 30 days to try it out... 1. Is this price too high (as someone else had noted)? 2. Any other Derby owners out there that can share experiences? Specs... 2003 Simplicty Derby 2148 21 HP Briggs, V-twin Dual hydro pumps 48" fab. deck Serial number plate states "Ferris" and says "built by Ferris, a Simplicity Company"