I had pretty bad hunting problems with Blitz SSDV which came with it's own hotpipe as it was welded onto there... shocking never again on the hotpipe!
With the SSQV it's obviously fitted to colpipe section cos it replaces original recirc location and there was mild hunting but no way as bad as before with Blitz item. I happiily lived with it and didn't really notice jerkiness or what not on gear changes etc...
Yeah the £265 is special price quoted to me... think it's more like £300 with Sumo et al and careful, the lower prices tend to be non-kit just SSQV product so you'd have to source your own recirc adaptor plus hoses etc!