You don't by chance work for them do you? Don't you have the same thread at Plexi palace? 400.00 smackers installed plus it looks a bit invasive, better sound perfect... To have to do that to each of my heads is just not worth the bucks, my Weber at gig volume is great and I run my amps wide open in the studio so I know where the differences lie tonally and honestly at gigging level it just isn't that much. At lower levels sure ( below 3 ) but I can't see spending the cash for the benefits lower volumes. I paid 160.00 or so for the Mass that works with all my heads vs 400.00 a pop for each amp, I just don't have the disposable income to do it.