DAS is a great example of what seems like the very few companies who really stand behind their work. My first generation (1991) Miata’s AC was , by all research, a lost cause. They resurrected it at a fraction of the cost of replacement and when a 30 year old o-ring leaked, they replaced it – on warranty. My expectation was a reasonable charge for shop time – something most places would gleefully charge. These guys absorbed it. That’s the highest standard of excellence.