1- Can the Megs Microfiber Pads be used with any polish/compound/AIO or are they specially formulated for the Megs products?
2 - Do you need to buy a special backing plate or do they use they same backing plate that comes with the PC 7426?
3 - Do they work better than the regular foam pads?
I'm sure may people have used the pads with different products...but the D300 (compound) works SO well with the Megs MF Cutting pad...and it is very reasonably priced...that tinkering with the product MOST times probably wouldn't be needed.
Any standard 5" BP should work fine. I just bout the "Kit" that came with MF Compound MF Wax, 2 cutting and 2 finishing discs, a detailing apron and a new BP. I really like the BP that megs sells with it, and i like that they actually give you a RUBBER washer rather than the standard nylon one that usually comes with BP's.
IMO compared to say...105 on a foam pad (Using a DA that is) it is better. Why? Well the dust is much less for one. The work time is much longer. It wipes off smooth as butter. And of course you still get great cut.
Now personally, if you're going for a full 3 step process (compound, polish, wax) I like going with 205 with a LC Tangerine Hydro-tech pad for my polishing stage. Now if you want to skip that step and just use the D301 which is a polish/wax in one then you will still get very nice results, but the 205 step to me, especially on DARK paints, really gives the paint that crystal clear look.
Look here, thats the process i used on this car (D300, 205, Pinnacle Souveran Paste Wax)
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