Comprehensive review of mavericks,
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This review is from: OS X 10.9 Mavericks: The Ars Technica Review (Kindle Edition)
Siracusa's reviews of the Mac OSes are justifiably fanous, he's incredibly thorough and he gives this revision of the OS a guarded welcome.
The main features of Mavericks that is worth having seems to be better power management for laptops, combined with some general speed gains - it seem to be LIon's Snow Leopard, as long as you don't use gmail (there have been consitent problems with google IMPAP mail accounts which may have been fixed by 10.9.2).
Worth a read.