I've only had this subwoofer for under six months and I will be selling it as I will be upgrading. I think that most people is forum is aware that this subwoofer is a superb performer that produces very low, very clean, non-distorted bass flat down to the low 20hz. The sub is boxed, comes with user manual and is in excellent condition and because I haven't had it that long, I can't afford to lose alot of money on it. I think £600 is a fair price considering the mint condition it is in and for the short length of time I've had it and it would be best if buyer collects due to the huge/heavy nature if this sub. Demo of this sub is also welcome.