It is a rackmount system. I trust everything Sweetwater sells. So the five star (wow blown away) ha, goes for company experience and how accurate and proficient and overall professional the guys, especially Jim Watson are and is, at Sweetwater. As a machinist in the past, I understand how much time and work go into making a part and keeping it accurate and within tolerances so it matches whatever it is for. So the price does not surprise me. Question is, do you want to mount your pro fx 16 or not? Do you care if it is right or not? One that matches the rack system and mackie pro fx 16 perfectly and looks professional and not cheap or rigged? Then this is the pack you need. Actually, is a good deal at roughly seventy bucks. Nothing is cheap when you go pro. You get what you pay for. No doubt in my mind if you find something not to your expectations, they have no problem making it right. Professional business for the professional minded. Everything I buy here is fast shipped and meets all my expectations for the prices I pay. Thanks a lot!