This series of patch cables is essential for any modular synth setup. It's so useful to be able to stack them, and it gives lots of opportunities for designing sounds that would else be difficult to make with just regular patch cables.
Pros: Good quality cable that does what it's supposed to do. The connectors seem to mate well into mini-jack sockets, without any noise. Stackable. Nice that the various lengths are in different colors, makes it easy to tell them apart.
Cons: None that I can think of.