I have a Makita 9227C and have used pads from ECP. They are very good quality and fit very well. I'm now using advanced polishing pads. Soon to try something from this site.
My felling is that Makita makes tools and probably subs the pads to someone else that makes them for Makita.
Personally I'd stick to brand name pads and pay the difference. It's the difference between wrecking the paint and doing a good job. A pad usually lasts me about 40-50 vehicles. That's about 20 cents per polish. Pretty cheap if you ask me.
If you are looking to save a few bucks, I'd try somewhere else.
Boy, I just re-read this...Don't mean to sound like I'm coming down on you! Don't read it that way. Get the good one, you'll be happy you did.