Not bad. In terms of value, they are worth their money. Irwin and LOTS of instrumental companies are going under so it's nice to get something that isn't complete bullshit!
If irwin had said their drills were the wrong size and a smaller diameter, I might not have broken my chair leg drilling to install a roller anchor. Thanks Irwin 3/8 measures .346 versus .375. This was enough to cause a problem.