I bought the Mequiars microfiber DA system when I worked at Jegs's, mostly because I got a good deal on it. It works good for what it is, I made a lot of progress on my Impala with it but it's not quite there. I think a flex 3401 is in my future so I can get a little more aggressive, and try some various compounds and polishes.
I really like the Chemical Guys products I have tried, of course I have two white cars and a black Impala so I have only used their color specific stuff, for that I can say I am very happy with their whitelight, blacklight, white wax, and black wax.
I'm still up in the air on what I'll use for a better selection of compounds and polishes, but I think all I plan on doing this year is doing a sealant on the cars in the fall.