I have used an SF-2, a FX-1 and the F2B and they are all unique, with the SF-2 being by far the most unique. Mica calls it "the Swiss Army Knife of Tone" and with good reason. There are so many possible combinations of sounds possible when using this unit.
It will change and add to the tones your bass is capable of. Will it make a P Bass or any other bass sound like a Series bass? Well, I don't think so, but it will give you so many possible tones from your setup that it would take days or weeks to find them all!