The issue with Feng Shui is that it's results are static, not dynamic. In other words, it's very impractical. The master comes to your location on a particular appointed date, provides her/his services at that particular point in time, tells you what to do, then leaves.
Subsequently, if the environment of your location changes, for instance construction, renovations, etc. all these changes become fertile ground for yet another round of Feng Shui consultations. The calculations for initial consultations no longer holds.
And to top it off, yes I agree with some others here, some Feng Shui masters can be quite arrogant. They behave as if their calculations are accurate down to the minute. If you miss the procedure by a few minutes, they'll verbally fuck up you up, especially those so-called grandmasters.