First off, the OP didn't ask what other products people are using....he asked about a specific product. Nice plug for Tomahawk, but it is off topic.
So now, in response to the OP, I will say, I haven't used this Auron product, but If I did, I would not call it cheap....at least Muellers carries besides the normal straight up 5/16 thru hole version, they also carry the threaded, capped ones, but at a price....but CC doesn't offer it threaded, and you cannot thread their blanks at 5/16x18 as the thru hole is that size. I like to drill/bore and thread my own as the materials I use, as a repairman, and builder, are blank, meaning I can make it any size / any thread needed to deal with whatever I need at the moment. It may be a great product, but it isn't available in the best form....blank rods> At a price point of $4 a ferrule threaded and capped plus shipping, Not a bargain to those that can do the machining themselves.
Dave