I started my tool collection back in the day when I was a young newly married man without a lot of money, so I would buy the wrenches I needed one at a time to do the particular job at hand. As a result, I have a very eclectic collection of tools but significantly, each tool was perfect for each of the particular jobs I had to do. Sometimes all the wrenches in a set are not ideal and you need a different brand for a particular job.
Ever since I discovered Harbor Freight, I have bought all of my tools there and I find the quality to be very good, except perhaps for their ratchets which are not the smoothest, but for that situation I also bought a Facom 3/8 ratchet, made in France, and it is the very best ratchet in the tool box. Made like a fine Swiss watch. Effortless reverse motion. It's my go to ratchet and I have had it for about 25 years.
Now on sale on Amazon for $58.52. It's the most expensive tool in my tool collection, but a 3/8" ratchet is used every day for every imaginable job.
I also have several "Gear Wrench" box open end wrenches with the built in ratchet, and they are also the best. I think I got those at Advance Auto on sale.
I have a few Craftsman box open end wrenches and they are sturdy but too large to fit into tight corners and generally "clunky". I think that Sears originally offered the Craftsman brand in their catalogs for sale to fix really heavy duty farm equipment and they are built to work on tractors and other farm implements, not metric motorcycles with much smaller parts and confined spaces.
I don't think I have ever bought a complete set of metric wrenches or sockets. I just buy what I need for the job at hand. Buying a complete set of metric tools is a waste as well because you end up with a collection of 16mm, 11mm, 9mm and 7mm wrenches that you will never use, but a 19mm is usually missing. So four of the wrenches in the set are useless but the one you need has to be bought separately.
There is one particular special tool that we all should have in our tool box if we are serious about working on an XS650. You won't know you need this very special tool until you find yourself working in your freezing cold garage in the winter after consuming 6 to 8 beers and have just returned from the warm kitchen with another beer in hand struggling to remove the starter motor. There is one bolt in particular that is impossible to reach with any of the many tools you have in the tool box, half of which you have thrown across the garage in frustration. Your cursing and screaming has awakened the kids and the wife is threatening you with divorce and it's 2 in the morning, too late to go to the store and buy the tool you need, even if you knew what that tool should be. Well, here it is:
I haven't used mine in a while so I forget what size it is, but go out to the garage right now and find out what size the bolts are that hold the starter motor and then rush down to Harbor Freight and buy an offset wrench that size. Place the wrench in one of those fire extinguisher glass cases and break the glass this cold winter when you are removing the starter motor. And stop drinking so much beer!