To the question of quality: Of course, but I think this is a case of intersecting curves - that is, because 3/4" is just such a big brute piece of metal (cross-sectional area going up with the square of the radius and all that), you can get away with a cheaper mechanism and weaker alloy, and it's still not going to break. My most recent acquistion was one of these, bought on sale at half-price, methinks:
https://www.princessauto.com/en/3-4-in-dr-x-24-in-ratcheting-breaker-bar/product/PA0008609018
What sold me on it was the reviewer who said that it didn't fail even with his big fat brother jumping up and down on an extra 2' snipe...
It varies from place to place. My general understanding has always been that the ice melters used are more corrosive as you go east, but that could be a misapprehension. I do know that the salt that's used in the Maritimes adds a whole other level of danger because it draws moose onto the road to lick it up, and you come over a hill or around a curve and bang you're dead. Here out west I think some jurisdictions use non-NaCl melters to cut down on both corrosion overall and environmental contamination.