So, I have the G9 and G8 with a good selection of 5-inch and 3-inch pads (and a couple of 6-inch pads). I am looking to get faster and deeper paint correction done down the line. I am looking at G15 and G21 as I love Griot`s products (and awesome customer service) and the removeable cord system will make things very easy to switch between polishers. Should I get the G15 or G21 with the G9 & G8 already in place? What would you do?

A side note, has anyone been able to compare between the Shurhold 3500 and the new G15 or G21? I wonder if it`s a comparable choice or simply inferior, price not being a factor.

Thanks in advance for your comment/advice!