Jamming up synthesisers/semi-modular against each others can get you wishing for a product that helps getting it all snuggled close together.
These midi-cables are flat and the connectors are angled differently at each end so you can choose which way they should go, because they might cover your 'through' port if you use one end, which is alright if you are not using it anyway.
Construction wise seems solid enough, I have not had any problems and since the angled contact helps with not stressing the cable as it wont push up against a wall or other equipment it should last.
As is if the flat backside of the connecter where even shorter, just covering the DIN/MIDI part it would be even more versatile.
They fill a need in my studio and I am a happy buyer.