If you only need 3U and are low on money, this is the one, we house a powerbrick an the back, 4 in-ear transmixers and some cables in this one. It is as sturdy as you pay for, but mixes well with our 2 4U cases. It's a bit wobbly but protective enough for hours on the road. installation in this one was a bit sketchy as the threads and holes didn't quite match up, but a small tap with a hammer made it fit. It is what you pay for