You may be blessed with great tap water, but even with great soft water from the tap, you should eliminate chlorine or chloramine, if present, by using a Campden tablet treatment. As you go all grain, water content becomes much more critical to get the right pH of the mash. Once the mash pH is in the correct range, Al grain beer is improved significantly.
save yourself a couple bucks and leave the 5.2 out. it only works on a very specific water profile anyway and unless you know what’s in your water to start with you’re just shooting in the dark anyway.
I’ve yet to find anybody who has checked on their ph and found it really hits 5.2 with that product but if your beer tastes good with it then that is the more salient test.
I haven’t had any issues with flavors and the ph does hit 5.2-5.3 consistently. I have a cheap PH meter I bought to verify my Starsan. I’d like to buy a carbon filter of some sort to prepare water. Maybe I’ll buy some water for my next brew and see if I can detect any variations.