Pros: Well-made sockets, handy case, reasonably priced
Cons: The case can be hard to open at first, but it gets easier with use
I needed a spark plug socket for my lawn mower and didn't want to spend a lot of money. After comparing several different socket sets online, I decided to go with the Stanley 6-Point Professional Grade Spark Plug Socket Set, part #85-721, and I'm glad I did.
Stanley is a reputable brand, known for good-quality tools. This spark plug socket set definitely falls into that category. The set comes with three different size sockets: 5/8", 3/4", and 13/16". These are three common sizes for spark plugs (the last size fits many lawn mower spark plugs) so it's a good basic set to have if you plan on changing or removing plugs. All three of the sockets use a 3/8" drive, so you'll need a 3/8" drive ratchet or an adapter.
The sockets are solidly-made, with Stanley's Max-Drive design for better performance. They won't damage your plugs, and they do a good job of both loosening and tightening spark plugs. They come in a small sturdy plastic case which can be stuffed in a tool bag or hung from a wall or peg board.
Amazon sells the Stanley socket set for $13.20, which may seem like a lot of money but is comparable to many other socket sets, and with the Stanley sockets you'll be getting good-quality tools that will last a long time. Eventually, you may want a larger spark plug socket set, but if you're just starting to work on engines or you don't work on a wide variety of engines, this set should work out well.