A quick way to reduce his viewing audience by 1/10th too.
Don't take that the wrong way, I'm a Canuck too and I agree with everything you said. EVERYONE has some Mastercraft or Maximum in their toolbox here, including me. I also encountered them when spinning wrenches for money.
My suspicion is that the Mastercraft line is mostly Stanley Black & Decker production. The Maximum line seems to be mostly Apex (Gearwrench). So results from those brands more familiar to Americans might be relevant to us too.
One caveat though - recently Canadian Tire rebranded all non-ratcheting wrenches (except specialty ones) as Mastercraft, all ratcheting wrenches are Maximum. I think, but haven't yet confirmed, that this means the polished non-ratcheting Mastercraft wrenches are Apex - blurring the manufacturer ID between the two lines.
I am also interested in Ultrapro. I bought a big set after using my neighbor's - they felt noticeably different. My prediction is that they have tight tolerances and high hardness, relatively speaking. No fancy jaws though. My ratcheting Proto's remain my favorite, but there is something going on with Ultrapro that I like.