Hello Sawzall, being a Diesel mechanic myself for 12 years and being self-employed on and off the past 4 I have to say I've been around them all (tool mfg's) I've bought junk and good stuff as well mostly I'm Craftsman, I did and you will too have to buy specality stuff off the trucks, Mac, Snap-On, Matco, etc. I have had good luck with Harbor Freight's "professional" line stuff much better quality than regular HF stuff, had different circumstances struck me my tool selection might be better/different but I could afford Craftsman when I started and have been well pleased with them. Good Luck theres not alot of people that actually want to get their hands dirty to make a living anymore.