Awesome! John, the owner, is great and really gives it his all when it comes to your car.
I found them on http://repairpal.com a few weeks ago and after calling around to get quotes on senors and catalytic converters, they had the best quote so I decided to check them out on a Saturday. I explained to John everything that has been going on with my car as it's been a really big nightmare (with Firestone in Diamond Bar) and John did everything he could to test out my car for me especially my engine since I had just received an used engine. He did everything himself (there are also two other technicians there) and threw in some free tests for my car just to give me a piece of mind and also for himself. He wants things done right the first time, meaning giving all the time that is needed and is VERY thorough.
I brought in my car on a Saturday and John calls me during the week to let me know that he got a new machine that could test out more things for me. I would've never expected mechanics/technicians to do that but he did, very helpful and I'm very grateful to all that he's helped me with and is still helping me with.
Every time I call, John picks up himself and always just tells me to bring in the car if I need something checked out. It's a small shop but they really do have a big heart. Everyone's so friendly. When I went the first time, I didn't realize that they had just opened for 3 weeks. They are a bit tucked in near Rent-A-Wheel but they are totally worth it to go get your car checked. They have wi-fi also, so you could just wait there if you need to. They also have a tv. It's a great "mom and pop" type of shop. They are very trustworthy and give you all the prices up-front. John will call many different places for you just to get a better deal on a part (which is pretty good already compared to what we would get ourselves because we don't own a shop).
He thoroughly always explains things to me about my car and even shows diagrams and etc on the computer for me. He also prints them out for me to explain more in case I don't understand. VERY thorough, VERY kind, and VERY professional. What else could one ask for? (especially since I've been burnt out by some already).