Personally if the space is small then the "power" is enough. But if one got a big space i.e. big living room or big room then better forget about it.

The sound initially could be an issue, but once you got use to it you will not be bothered about it. Similarly like standing fan, sometimes the blade or bearing will gives sound as time goes by which personally I prefer Dyson's sound than those squeaky sound made by circumstances I mentioned on standing fan.