A good piece v kit, but dont pack too much punch that it cant handle. or otherwise, dont push it too much as the active amplifiers have a tendency to get very hot and overheat and conk out.
Also...i have noticed how these subs fail and suck themselves in solid so that all the flex in the coil from the speaker is lost.
Simple test is to jus push ur palm on the centre of the subwoofer n check to see that there is flex there.
Sum vibe subs that have failed in the past have had symptoms of high frequency sound cumin from it...almost like its a massive tweeter...wher it has lost all flex in the coil and is pretty much blown.
But for £70 and workin..cant go wrong. very heavy duty piece of kit otherwise.