I'm using them for almost a year now to patch pedals with a switching system on my pedalboard.
It's very easy to assemble! I had only one jack that I didn't connect right and I fixed it with ease. All of the other connections worked fine and it was my first time connecting them.
I love the size of the jacks, they work very well if you have a switcher with many ins and outs and they generally use so little space on your board. The cables are thinner than usual patch cables which also saves spaces in cluttered areas of the board. However, the cables are not the most flexible ones, this can be a pros or cons for someone. But if you measure the needed lenght and position the cable you won't need to worry if they coud move anywhere, they are pretty much fixed because of that lack of flexibility.
The sound improved also, but be shure to have a high quality cable leadin from your pedalboard to your amp also. I've only noticed the improvement in my signal after I've changed that cable and could actually hear the result of these patch cables.
They can be quite an expensive investment, especially if you have a big pedalboard like I do. You can also buy extra jacks if you need more, I had to buy a vouple of more.
People have different opinions about these cables but if artists like Steven Wilson and David Kilminster kan tour using those than that says enough about the quality and durability.