I mean...it's a cable. A normal cable, absolutely solid and works perfectly...
But MIDI should be an universal "language", standard for each device and based into normal development of any device.
Like the USB....
...BUT, as we got Apple that force you to use a custom plug, we have Darkglass and suddenly MIDI has a different "type".
So, here we are, if you need to connect a MIDI port on your Darkglass (and I think some other brands, don't know about that) you NEED this one, not the standard type A.