IMO...if you have a PC use that for AIO's, especially if noise level is a concern. Usually I use my PC on speed 4 for AIO's. Works great, it's easier to maneuver, lighter, etc...and on speed 4 you don't get that horrible screaming noise with the PC like you do on speed 6.
However, if you don't have a PC or just really want to use your Flex (which I completely understand) I would still recommend the flex on speed 4 for AIO's. Heck, I spread polish with speed 3...anything lower and I notice the Flex doesn't quite feel right. Maybe it's just me, but on speeds under 3 the flex starts sticking and grabbing more and doesn't really seem to spread or work the product evenly. Personally I just don't like using it at those lower speeds.
I know there's been many comparison charts of speeds between a PC and the Flex, most show a 1 or 2 increment difference between the two (ie if you would use the PC on speed 4 that would equal the Flex on speed 2). But I just don't know if it's that simple of a comparison. There's just something about the Flex on speeds below 3 that just doesn't jive with me. I don't know if it's the addition of the forced rotation and how that works into the feel and even science of what the machine is doing. :nixweiss
Don't get me wrong, I LOVE my Flex...just not so much at the lower speeds, but heck, what do you really need those for anyways.
