For the Flex users out there, here is my feedback on that tool...
I found that personally, I didn't care too much for the Flex and MF
cutting disk. Maybe I'm just so used to using the DA and MF disks and I just need to get used to it a bit more. But like Stoops stated above, it won't leave as good of a finish as the DA and 5.5 cutting disks. Leaves a bit more haze, and my biggest aggravation is it's way to grabby. It tends to snatch you around quite a bit more than using the DA. But with the new Flex 4" backing plate coming out, this may be a winner! Who knows? But I will be one of the first in line to get the new backing plate and try it out.
However, the Flex with the new MF
polishing disks is absolutely outstanding! It glides along incredibly smooth and effortlessly! None of the same grabby feeling or snatching you around like with the cutting disks. For my customers requesting a 1 step solution on their vehicle, I'll use the Flex with a Polishing pad, and the new Finishing Wax.
Also, I'd like to add(going back to the DA and 5.5 pads), that on about 60% of the details I've performed with this new system, the finish left after using the cutting disk and DA Compound was absolutely outstanding! And didn't even require a final polishing step. I know you're not going to achieve results like this on every single vehicle, but it's nice to have such an outstanding finish from a compound.
Here's a nice close up of a 50/50 shot that I did. This was after 2 passes of the DA Compound and nothing else. No polishing, no wax, nothing. Just the DA Compound applied with the Griot's DA and a 5.5" cutting disk.
And here is a Viper I did, Griot's DA with a 5.5 Cutting disk with M105. This picture is with a coat of Wolfgang Fuzion on it, but there was no polishing step on this vehicle. One single pass of M105 and a cutting disk left this finish amazing! I know it's kind of hard to tell with this picture, but it's the only one I have loaded up on my Photobucket account at the moment. I hope to have the rest uploaded later today or this evening.
Anyhow, I hope this helps a little.
Nick