Device : [Omnia i900]
ROM : [ J1 / Stock ROM / WM6.1 ]

+1 coreplayer loads flv on the spot without the loading indication which means speed improvement when loading video and fastforwarding them, good for me..i had over 10gb of flv movie download from crunchyroll hehe (but bring not much diffrences to mpg, avi or any other format)

+2 microsoft office (power point) loads faster , can see the loading speed improve when opening very large files

+3 wifi usage improvement, during web browsing and RSS .. ( not confirm about this but seems to be faster than last time i used it, maybe my imagination, if someone could reconfirm this)

after testing for one week, i found only these 3 diffrences