This isn't the most solid flight case out there but is fine for what it is designed for- specifically transporting microphones and other small items (I carry 2 x mics, the wireless receiver, my DMX dongle, and all the associated cables).
The dividers are only thin covered wood and probably wouldn't hold up to much abuse but they do fix firmly in place which is the main thing and can be positioned to suit so you can divide the interior up however you like.
One slight disappointment for me was that the actual available interior height is very little compared to the height of the actual case. The extensive padding top and bottom means that you won't accommodate anything higher than a couple of inches. But then this is designed for mics etc so it's understandable.
Also the clips to open the case don't have any kind of retainer like you normally get with case clips, so once the clips are flipped the case opens. Not a major issue but worth keeping in mind if the cases get piled in a van etc with other stuff.
Overall though a case like this is a must have if you are transporting microphones around regularly- far superior to a bag etc and huge value at this price. But a lack of interior height means you won't use it for much else!