"Are these barrels temperamental at all? Do I need to keep them perfectly clean? A PDF I read on Rainer Arms website about their match Wylde barrels kinda threw me. I'm not a big fan of babying guns"

Referencing the maintenance PDF, I don't think you have anything to be overly concerned about. They kind of give you the go-ahead to develop your own regimen in the final paragraphs. If it's a Shilen barrel, as mentioned in the PDF, you shouldn't have issues. I don't recall hearing too many negative reports on those.