When Mr Tay start fixing a problematic camera or lens, he repairs more than what you deem to be the only fault at, but more of a time he's really kind enough to check and overhaul most of your soon-to-be problematic parts as well & sometime without any addition cost.
Yes he may delay the handing over time but you must know that you will get your camera in return for running smoothly many years ahead.
I have been there for a couple of times for my A & A products and yet almost every visit I went I can only hear praises from pass & current customers thanking him for doing this or spending that addition effort for that.
I personally see him as someone who not only repair, but also to perfect it everytime.