I'm close to buying a sub to augment my new Monitor Audio BX2 speakers. The wharfedale sw150 looks promising but the yamaha has caught my attention. Previews describe it as PWM digital drive high efficiency amplifier and dual feedback circuit and new Twisted Flare Port contributes to clear and tight bass. It also looks amazing. The weird thing is I cannot find one single review on any internet site, good or bad. Not by professionals or consumers. It's like a news blackout. Anybody had experience of one and how does it compare with the SW150?