My company has been running Roadtec RX 10's (or Carlson CP 1220 if you prefer) for about 15 years. I personally average 1200 - 1300 hrs a year running one and can say that in the right hands it is a very productive machine. The majority of our work is in the city of Boston and our trimmers take a heck of a beating on a daily basis resulting in fairly frequent breakdowns (mostly hydraulic lines and drum shafts), because of this we bring two trimmers to each job so as to not kill production. I have a post in the "square yardage" thread describing my only interaction with another brand of trimmer i had a few years back. Its my opinion that some trimmers are best suited and designed for city work with alot of steel, gutters, radius's to trim while others are best suited for more open work such as beveling lips, trimming guard rails, and cutting keyways. I guess depending on your scope of work the only way to find which one is best for you is to demo all of them. Good luck, Roy