It depends ...
I've using OMNI since last Nov.as my daily driver and already enjoying it. Better speed more smooth.
Go check the list of known bugs and issues of OMNI ROM in this thread
and see if your wife will be able to deal with them on a daily basis.
And I can add:
USB storage doesn't work correctly till now.
Music player crashes on few nightlies.
Camera performance was better on the stock firmware.
Some battery draining issues from time to time.
Remember Nightlies are experimental builds.
Main Phone: Ericsson SH 888 – Motorola StarTAC 85 – Nokia 3310 – Nokia 1110 – Samsung D900i -
Samsung Galaxy Fit S5670 – Samsung Galaxy S II I9100 - Samsung Galaxy Note N7000.
Backup Phone: Nokia 206 – Nokia Asha 205 - LG Optimus L1 II E410