ive got some of these, theyre in a little tool bag in my top box with a small gas soldering iron that doubles up as a lighter. i figured that whilst i dont want them for permanent fixtures, as a roadside repair and get you home theyre a cut above the usual chocolate block or cheap crimped connector. not had to use one yet, but they were cheap, certainly a lot less than that link, although the box i have is only small with a few of each size in it.