I've been on Shiny 4.4(112713) about 24hrs now and it is smooth as silk so far...seriously new life for the device. Hangouts as the default (and only installed) SMS choice sucks (but I'm wifi-only on the device, so whatever). 10k even on Antutu.
I used CM recovery (6043), wiped both caches and data/reset, flashed latest radios (FK01/02), Shiny, SU (1.8), pa-gapps (4.4, and in that order), reboot...and solid so far. That easy. Recommended!
(Can't speak to Exchange issues, as I'm a TD user...also highly recommended!)