Max Factor Subs, any good?

Hey, my buddy wants to sell me 2 Max Factor, 12inch subs.....i was just wondering, in the world of subs.....are these any good? Like what are some of the best names when it comes to subs?

i dont think that i would take them. are they rated in rms or max? some good brands are jl audio, mtx, rockford fosgate, audiomobile, adire audio, pioneer premier, orion, infinity, eclipse...........there are so many of them. there are also so many bad ones. mobile authority, pyramid, rockwood,. stay away from any brands that state they can handle a lot of wattage for cheap price.