Anyone use these? I see there is a user selling a grip of them for 675$ a unit. Have a couple gigs that could benefit from having 2 dual 18s a side and I just have a pair of 728s currently. Using SRX tops that will eventually have to be re thought as well. Just asking out of curiosity on opinions. I get some generic riders from some corporate style stuff occasionally and wouldn't want to turn people off but do have some stuff with lax requirements as well.