I'm looking closely at SharePoint Online as an extranet solution for document sharing with clients. Ultimately, I'm looking for a solution that is easily "brandable", provides a professional presentation, and is easy to use for my users and clients. SP Online looks like it could fit the bill.
Has anyone had any experience with SP Online good, bad, or ugly? Part of the research is to also identify weaknesses, potential security compromises, and the like. I would appreciate any experiences, recommendations, and/or directions.