They are a great way to avoid those odd strands which short out on their neighbours, and I found that they made wiring into terminals in confined spaces much easier. I bought a cheap Chinese crimping tool off eBay but without realising, ended up with a 6-jaw tool. I believe that quite a lot of them have 4 jaws which doesn't feel as if it would give as good a crimp. Anyway, a great thing to have discovered - and I found it thanks to this forum as well!