Does anyone here use the Corona R-675 Multilength Frame? http://www.thepaintstore.com/Corona_R_675_Multilength_Frame_p/r675.htm Does this cage have a threaded end to accept a standard threaded extension pole? The wing nuts on the side makes it seem it uses a tapered extension pole. If so...

I am looking to upgrade my business to using 18" roller cages instead of standard 9". Looking for suggestions/ pros and cons about major brands/models available at most Benjamin Moore dealers and Sherwin Williams dealers. Looking for ease of use, and quality pros & cons and also cost.