Spend the money and buy it - you will not regret it. I wish I had bought one long before now. You can purchase the Velcro style backer here on amazon. One last thing, the dust collector are very easy to clean. I did find the battery a little difficult to remove.
Astro Pneumatic Tool 300SP Features & Specs
DAQ - Dual Action, Quiet Performance. Used for feather edging, metal preparation and finish work on body filler
Built-in silencer and motor insulation provides quiet operation
Balanced ball bearing construction for vibration-free performance
Built-in regulator for positive speed control
Editor's Impressions Of The Astro Pneumatic Tool 300SP
Tool Motor Power
Random Sanding Action
Value For Money
Astro Pneumatic Tool 300SP Final Thoughts
"These are great sanders."
7 amp model, I debated between it and the newer 6. At the top end, it has a rich, powerful voice. So i guess i'd be back on Amazon real soon! Having the 2 inch and 3 inch size is very handy. 4 stars because it doesn't hook to my shop vac.