I have a set of the Blue Handle Irwin/Marples from when they were still made in Sheffield. The backs weren't very flat and the side bevels aren't very sharp. They're a bit clunky due to the heavy handles but they hold an edge and take a beating without complaining much. They were what I could afford at the time. I use them for rougher work.

I have a set of LN Socket Chisels too. They were much more expensive. They were worth it.