I've used them for some years now but this last time was even more outstanding. Their honesty is second to none. They found the issue and saved me over 4k dollars. They also showed me how my car was running graphically (catalytic converters) and put my mind at ease. I know they aren't the cheapest - as a matter of fact I know that at times they charge what the dealer charges (hourly/parts) but like the dealer they don't want you to have to come back for the same issue so they do their best to fix it right the first time.