Well, I'm impressed!
I dropped back into quite an old save and the new graphics look fabulous. There are some anomalies - some bases need a bit of re-editing as some parts weren't quite working - but overall I'm very impressed and quite enjoying being back in the game, bumbling around and just having a chilled-time. I've also noticed that there is new flora and fauna to discover even on planets that you've (fairly thoroughly) scanned before.
The water effects and clouds all work really nicely - sure there are still glitches, but meh - it's a game, so...
Thus far (early days) it's looking good, I just need to reacquaint myself with all the various controls and in-game mechanisms!
E. ...there can be quite a lot that needs reworking on old bases. The base structures can be broadly fine, however almost all of my 'automatic doors' now need reworking...