I have the "real" JFJ Single Arm resurfacer. I swear they've made the pads and fluid crappier and crappier over the years. It used to be that unless a game was seriously gouged, a minute with the white pad and polish would make the disc brand new. I didn't use the blue polish for the first two years I had the machine!
Then all of a sudden, only using the white stuff didn't make the disc look as good anymore. You could see swirls all over the disc. So I had to start using the Blue polish.
Then, one minute wasn't taking out scratches. Had to bump up to two minutes, and the pads seem softer, meaning I'm burning through them quicker.
Now, unless the scratch is very light, I gotta sand with the soft sand paper, two minutes white pad, one to two minutes blue pad.
I'm on my second JFJ. I'm ready to take the plunge on the Azuradisc machine. Yeah, it's $1500, but it does in 30 seconds what the JFJ is taking me 4-5 minutes to do.