I own a Makita that I have very nearly worn out (and would buy again). Interesting enough, I bought the 7" Harbor freight model on sale for $24 bucks a couple weeks back. I then tested an area with the makita and then with the HF. The HF is no Makita, but you know what, it did the job. It does not pull quite as nicely when the pad starts to load up, but that can be taken care of with spurring at slightly more frequent intervals.
Even bigger surprise. I tried out the $6 wool pad from HF too and I'll be darned it the darn thing nearly kept pace with its 3m brother. Sure it shed a bit more at the start, but when its 30 bucks less, I can put up with that.
If you don't own a nice 7" buffer and not sure, I have to laugh a bit and say that I really can't find a reason to not recommend starting with the HF cheapo's. By golly, I think they actually might do the job. By all means, DO get the Makita nice unit if you want to spend the money, you WILL like them better, but the HF will do.
bp