I first used Ken two years ago when my radiator died. I didn't live far, and he actually drove out to where I lived and did the work on the spot. He was done before lunch time. Now I live permanently in Austin and take my car to him whenever I need something done. He replaced the timing belt in my car (a camry with 180,000 miles on it) a few months ago and gave it a tune up. From talking to him and seeing him work, my impression of him is that he is very thorough in his work and takes pride in doing the job right. I'll probably end up driving the camry all the way to 300,000, and as long as I'm in Austin I will keep taking my car to him.
Pros: cost, quality of work
Cons: he's a one man operation, so some work will just take longer (ex, oil change)