I have a whole set of the from Gearwrench. From 8mm all the way to 36mm. I,m an auto tech for a living so my tools get used on a daily basis. I like these wrenches because they are cheap, nice looking, and durable. The open end will want to round off bolts more than say...a Snap On wrench, but who really cares. Combination wrenches are a last resort of a tool to use. Realistically, for me, they get less use than any of my other hand tools. So, just say NO, to Snap On prices. These work just fine for regular use. The extra length gives nice leverage. The polish makes it look like a more expensive wrench.
If you use combination wrenches a lot, like all day every day, invest in some nice MAC or Snap ON wrenches. If you use them only when you have to, and mostly rely on ratchets, and ratchet wrenches, air tools, etc then give these wrenches a try. They're nice for cheap tools.