I wanna be clear in that I believe F-Secure is one of the best AV options on the market right now, both in terms of how well the product performs as well as the company’s long track record and commitment to ethical practices. A lot of us have criticisms for every AV package out there because they all have room to improve — I could write just as much about what is wrong with ESET, Kaspersky, etc.
DeepGuard can be a little sensitive, yes, but that is why it is one of the strongest zero day behavior blockers on the market, and has helped boost the product when their primary engine (BD or Avira) has gone through ups and downs.
IMO as a consumer, DeepGuard false positives are easy to troubleshoot and deal with. DeepGuard only terminates processes, it never deletes files. And the block notification can be clicked to add an exception.