they do the job, but don't expect to use them more than a couple of times. They'll rip apart when/if you try to remove them (you have to be very, very patient). If you change cables for some reason, the best solution is to unsolder the plug and remove the thing.
The colour labeling is a great thing and they seem to last.
Worth the money, enough of wires and having your cables tied up in a giant knot.