So, som positive GPS experience with the 5+ Titanium:
https://analyze.dcrainmaker.com/#/public/ddf8f784-9ce2-4986-50a5-88526ff87aff
This is a cycling track comparison between the 5+ Titanium and a Wahoo Elemnt Bolt I took during an easy Z2 recovery ride. 5+ was using GPS & Galileo. First of all I find that the 5+ tracks looks slightly better than the Bolt if you follow it along. Yes it is sometimes off (massively towards the end when I did cycle between the skyscrapers) but annecdotally I'd say it looks pretty good.
I am even more impressed by the recorded altitude: Both units have a barometric altimeter and agree quite well on the relative differences but the 5+ seems to be spot on regarding the absolute altitude (if that makes sense at all). Around 44:30 there is a sign stating that the point is 98m above sea level - pretty much what the 5+ recorded. The bolt seems to be thinking that it is quite a bit higher.
Of course a single example is annecdotally, but I still like the result.