The best PIS I have come across is on Dutch Sprinters. The square PIS tells you where you are, where the next stop is, when you will reach it and then the further stops down the line. If you are blind, the automated announcements tell you the same thing, as you approach the next stop, when you are stopped, and then when you start off again. The voice is feminine, it is clear and comforting. Extraneous announcements that plague British trains are absent and only the guard sometimes comes on in order to tell you something interesting. He or she will always begin such announcements with 'Ladies and Gentlemen, good evening'.(for instance).
Good manners cost nothing.
This is fitted on all NS trains now, with the old dot matrix displays switched off. I agree it's great - easy to read blue/white screens that show calling points, arrival times that are adjusted for delays, connections at stations with their platform number a couple of minutes before you arrive.