I finally bought one of these PAPRs. We purchased an used them at my last place of employment for the boiler operators, who worked for me. They are pretty nice and I knew what I was getting. The main power unit I purchased off Ebay for about $850 shipped and tax. I bought the helmet separately for about $230, again off Ebay. The 600 can use the organic vapor cartridge and that's what I really wanted for finishing pens with CA glue. I find I wear it a lot in the shop. My dust collection is good except for the small power tools. I guess this is just added safety..