I added borates to my pool a couple of months ago to help control pH rise secondary to aeration by water features. I have mixed emotions about it sometimes. Nothing BAD per se...I just ended up be a little less impressed than I thought that I would be.
As for water clarity, the water does sparkle like Waterford crystal with the borax being in there. But then again, my water looked nice beforehand. I think that it looks better though. As for the feel of the water, it definitely feels nice and "silky" since the borax lowered the surface tension quite a bit. So much so in fact, that the meniscus (water line) in the test kit test tube is no longer rounded or concave, but completely flat. As for the pH though, I have found that I am adding more acid after adding the borax than I was needing to add before I added the borax, and with greater frequency. If I don't address pH rise at least every two days with acid, then the pH will go above 8.0. Whether the waterfall is on or not, it seems to make no difference. This has never made sense to me really.
Eventually, splash out will lower my borate levels. I doubt that I will replace the lost borax when indicated.