Hello jakkwb,
There are some postings in the forum about experiences with ePMP 2.4GHz radios (for example http://community.cambiumnetworks.com/t5/ePMP-2000-and-1000/ePMP-2-4Ghz-Performance/td-p/56574/page/2). Not sure if they are specifically comparing its performance with the UBNT Prism 2.4GHz product, but some feedback regardless.
Regards