I was not getting hot water to some of my taps and low pressure in the same sinks. I contacted DrainCom because I thought I had narrowed down the issue to a mixing valve that needed to be replaced. The plumber arrived on-time as expected and was extremely professional and polite. After several questions, he quickly determined that the mixing valve was likely not the problem.
Instead, he unscrewed the tip of the faucet tap, which contains a filter. After turning on the faucet without the filter, the pressure and hot water were fine. Instead of charging me over $300 for a mixing value replacement, he was honest to point out all I needed to do was replace the faucet caps. Suffice to say I was embarrassed at such a simple fix, but I absolutely appreciated his honesty.
Thank-you DrainCom!
----------
EDIT: 2016/05/27
After a few months, the problem returned - no hot water. The mixing valve was the problem after all and had to be replaced, along with the hot and cold water valves that had started to leak much more. I was reasonably satisfied with the price after negotiating from this new plumber and the work he did was excellent. I would still recommend DrainCom, but I've dropped my rating from 10 to 8, because I wish the original plumber had replaced the mixing valve the first time and also taken action with the hot and cold water valves that were leaking (he had indicated they weren't a problem at the time). Addressing this back then would have saved me some time booking a second appointment and money.
1st visit: $65, 2nd visit, $565. Total = $630