In reply to BruceM:
Never used the serenity's, however I replaced a pair of 60m genesis this year with 2x 50m 8.7 alpine senders.
A dream to handle & It’s great when climbing on them as you don’t have to worry about placing gear evenly between them, even though you do it by default without thinking.
I took one of them out last weekend for some winter stuff and it was a lot lighter than lugging my old 9.8mm 60m rope around.
Unless I was doing long alpine days or regularly doing long 2 hour+ Scottish walk ins I’d say they were pretty bang on for UK trad & some easy winter as a single. ( not had a chance to use them in uk winter as halves yet)
They feel super hard wearing & don’t really think most punters like me need a super light 7.5mm rope.
Hope this helps.