I originally called about a water leak from a shower stall onto the ceiling on the lower floor. He diagnosed that problem as a small crack in the shower stall that we hadn't noticed (i.e. looked for the small things first before opening up the ceiling!).
I also had some staining on another ceiling area that I thought was due to condensation on the pipe above, but he checked the inlet pipe for running water and checked the sink area for leaks. Diagnosed it as spill water leaking under the counter area onto the lower ceiling - again without having to open up the ceiling.
After I made the original appointment I also found out that the pipe leading to the outdoor faucet had burst over the winter. He repaired that at the same time.
So, diagnosed 2 problems and repaired another in one 1 hour visit for a reasonable price.
Friendly and easy to deal with.