Having had my SC I for almost 3 years, I can say that it does not disappoint for such a small package. This is in a 3600 ft^3 + leakage basement. Knowing how well the SC I performed, I was hesitating about a possible purchase of two of the SVS PB-12 Pluses. Well, when the price dropped I couldn't resist. After a few weeks of testing and comparing, I have to say that the SVS is the better performer. So if size is/not an issue, choose your poison.