small amount of units... How about brigade sized elite front line units... sigh...
Here we go, a little education about the theater of war in the Golan heights for the IDF.
A typical day as an IDF patrol in the Golan heights is being shot at about every 15 minutes by some whoever tribe terrorist group Allah has deemed worthy on that day. Golani brigade of the IDF uses Tavor. Golani brigade has been fighting and depending on their rifle for their life, say for the past 40 years since the Yum Kippur offensive of the Arabs in 1973.
These guys don't play dressup, they're not working on their tans in Cyprus, or eating souvlakis in Kosovo, this is the real deal here folks.
here's a link to some history about the golani brigade for anyone who doubts...
http://www.jewishvirtuallibrary.org/jsource/Society_&_Culture/golani_brigade.html
The Tavor rifle is also used by the Givati brigade, another front line elite unit, who controls the sought border of Israel with Gaza, another great place where you get shot at on a regular basis...
here's some history about the givati brigade, their specialty marine amphibious landings, I think you need a reliable rifle for that...
http://www.jewishvirtuallibrary.org/jsource/Society_&_Culture/givati.html
XCR has never seen a real theater of war to this day. being a contender in a rifle upgrade government project is not a theater of war.
So I dunno, that's a whole lot of trust in one rifle and one of the reasons why I bought mine.