Things which I observed Mavericks cause problems with today:
- 2013 MacBook Airs discharging their batteries as they can’t maintain a sleep state.
- Keynote ’09 showing font problems – some fonts lose their spacing information and end up showing text bunched together. This happens on two machines. So the old Keynote is now broken (by a bug) while the new one is broken by design.
- Similarly Pages does not care for those fonts, but seems to overspace as opposed to squishing together.
In summary, wait for Mavericks.1 or Mavericks.2 if you possibly can…