I have a 12" Starrett combination square that I bought 10+ year ago. It's a joy to use; smooth, accurate, easy to read. I also have a 4" Starrett double square. I use it all the time. It's accurate and easy to read, but it's not nearly as smooth as the 12". In fact, even though it's a oft used and trusted tool, it's a bit of a disappointment considering what I paid for it.
I have a cheapo Johnson 6" square that is accurate but not smooth and the embossed marking are hard to read. Despite the handy size, it never gets used.
I need a quality 6" combination and I've been considering going PEC. Seems to be solid quality and they cost 1/3 less than the Starretts.
-- Dan Rode
"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle