I have the ten inch version of the sub and at first I was very unimpressed. In fact my first one died in under five minutes. Coil was perfect but it broke one of the voice coil leads somewhere along the way . They did replace it after some back and forth emails and the second one so far has given me no trouble. They sound like a$$ right out of the box because they are so stiff. The looser they get the better they sound and the louder they get. Pretty happy with it right now. Sounds halfway decent and has plenty of volume. It is handling over rated power no problem as well. Others who have bought them have ran into some QC issues also but if you get a good one they are very hard to beat for the price.
i have there biggest amp sitting in the box lol apparently on another fourm some 1 benched it at like 1700 rms and for 99 bucks thats sum cheap wattage..lol