I previously had made two attempts to go back to iTunes via the Retroactive app, both of which went wrong - without any damage to my Music library although some cover art went missing; however following ErikGrim's post yesterday I tried again and it all went in faultlessly...no lost songs; no lost cover art, just a few artist images taking their time to refresh, which is normal in my experience.
As Erik says it's so much more responsive and has the advantage of scaleable cover art - 9 across in full screen mode on my 24inch Dell monitor.
I'm still using Music to sync with my iPhone, but for day-to-day use iTunes is easily my preference.