I know a ton of people love Mac tools, think they are the best truck brand, etc etc. I have 2 total Mac tools in my box- a pair of terminal crimpers where I'm about 90% sure are rebranded Klein or something and have served me well, and a razor blade scraper, which is pretty impossible to screw up. The rest of the Mac stuff that I used to own has slowly been sold off over the last few years.
I was soured on Mac about 10 years ago when I needed a leakdown tester. Snap-On truck didn't have one, but the Mac guy had one on his truck and I needed it that day. I bought the Mac one, which was an actual Mac tool. Went to use it and none of the spark plug thread adapters were long enough to engage the spark plug thread and seat against the sealing bore to make the tool actually usable. And this was for a GM LSX engine- not something rare or exotic. Went to return the tool to the driver the next week, since it couldn't function. Just so happened that the regional manager was riding along with the driver that day. The driver seemed totally cool about the return, but the manager guy wouldn't let him take my return- not even for truck credit, on an unused tool. The manager went as far as walking through the shop to the exact engine I had needed to test, to try and 'show me how I was misusing the tool'. When he finally figure out I was right, his response was 'Well, our adapters are the same dimensions as everyone else's, you're just going to have to deal with it'. When I explained that I had borrowed a Matco tester from a buddy to do the job, and it functioned perfectly, he scoffed and had nothing to say.
Thankfully the driver was a good guy- he made it right the next week when the manager wasn't around. Gave my a full refund. But, after seeing how the driver was managed, and hearing from someone higher up the food chain that seemed to be completely clueless, not to mention a tool that's needed in every race engine shop in the world not being designed well enough to be compatible with one of the most common engines in the US for racers, I lost all interest in spending money with them.
I would have loved to have dealt with that driver- he was excellent. Unfortunately for him, the product he was trying to push was substandard. I have seen nothing to indicate Mac has gotten any better in the last 10 years, so I'll take my money elsewhere.