Been riding with the "flat" sole version for several years. The "break-in" period (for me) was approximately 250 hours combined walking and riding time.
Somewhat uncomfortable initially and during the break-in time which passed rather quickly. I've "re-soled" twice now - and will offer the Combat Lite's, hand-down, are the most comfortable motorcycle boots I've owned - and highly recommend and endorse them. Would suggest consideration given to purchasing a "spare" additional set of laces.
Thank you,
-Elliot