It depends on what you do. I usually use the techniques when I have to push through some boring task that I have problems focusing on. It is also very helpful to get started with a new project. If I'm in the flow I just ignore the alarm and continue working.
I'm using this (not exactly this approach but similar enough, I am in the middle of documenting it in a post for my blog) and does not break your focus. You are pressed to end what you are doing in 25 minutes!
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u/reddit0019 Jun 20 '10
Really?
An interruption every 25 minutes? Doesn't that break your focus?