I've never felt the need to do any 'breaking in'. I've been happy with my boar brushes from day one. The only way you're going to know is try one unbroken and then either wait til it's 'broken in' to compare (if you can remember what it was like unbroken) or purchase another and try the 'breaking in' process to see if that is your preference. Will be interested to see what you think of the 48.