Not sure if anyone else has seen this, but I figured I would post it given it's the only review out there.
It's not the greatest review, but it has some useful insights.
http://www.autoexpress.co.uk/bmw/x3/...x3-2014-review
***Update***
I also found this one:
http://www.thecarconnection.com/over...x3-series_2015