Thats true. I have used Armstrong, Wright, and Proto wrenches over 1'' and up to 2'' plus. They quite a bit stronger and better quality. So far for my personal tools I only have Blackhawks usa made for over 1''. For occasional use they would probably be fine. What do you need them for? Or would you just like to have them?
Many people have had great success with the Klutch brand jumbo/super jumbo wrenches from northern tool.
I bought mine when I worked at a John Deere dealer. I got a couple of NOS SK big wrenches dirt cheap and then got a couple from Epstein's for a complete set up to 2". As for the klutch wrenches, they are probably the best import big combo I have seen. I'd be willing to buy those if I didn't already have some. I priced out the SK set from 1 5/8 to 2", over a grand. I was able to piece my set together for around $300.