i got mavericks. it sucked. my harddrive was giving out, so i upgraded my harddrive and went back to Mountain Lion, all in one go.
Easy upgrade. really basic on a macbook pro…compared to the old iBooks.
It is so fast now! Never going back to a disk drive! I would recommend a quality drive (I got the OWC OWC Mercury EXTREME Pro 6G, cost a bit, but seems well built) Just have to wait and see if it holds up…I'll keep backing up…