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Very easy to install and seem to be of decent quality. There's a sticker that wraps around the nut which identifies either red or black. I think over time this might come off since some are peeling slightly already. The quality though of the rest of it is quite good.
I really like these and recommend them highly. They seem to be of good quality materials and are well made. I assembled 8 of these in about an hour. Assembly is fairly easy to do if you strip the wire back correctly. Which is why I knocked 1 star off. The instructions tell you to strip off at least 1/2" That's way too much. You can't get the wires correctly seated around the post and then be able to screw the tip back. I'd say 1/4" to 3/8s" max. Then back the stripped wire back and you can insert the tip and thread it.
If you're going to do a lot of these, I'd definitely recommend some high quality wire strippers. Also, if you can find a solid piece of tubing a bit smaller than the threaded end of the tip you can use that as a tool to push the spread out wires into the base before putting the threaded tip in. It would be nice if Sewell included something like this with a bulk pack of plugs.