Very good quality. Solid. Removable padding parts are very handy if you have other types of controllers. Lots of space for other storage (cables, power supply, etc ...).
High quality but heavy bag with top workmanship at a reasonable price. Plenty of storage space for accessories. DJ controller (SB3) just goes in and is already very tight. I had to take out all the deposits and then you can press it in. The material of the bag is also somewhat stretchy. Even the outer shell is already thickly padded and with the various inserts with Velcro that are included you can tinker with the appropriate inner padding. (SB3 is then omitted as mentioned)
This bag focuses on the essentials. For example, secure padding. My Hercules controller has almost no scope to fall back and forth - cleverly processed. And a small pocket for various cables and small items that otherwise arise. The laptop compartment is also well padded. A really calming feeling when you know that its expensive technology is well protected :-)