Eventually more vulnerable to artillery shrapnel, but this is the case for all external equipment, Trophy radars included.
A former Israeli tank in a field along the border between Syria and Israel, in the Golan Heights, March 8, 2013.
The new sight has a significant increase in the FLIR aperture compared to the older one which will mean a lot more resolution. The interesting thing about the Merkava Mk 4 trainable sight was in some recent video of them in operation at XYZ the sights were XYZ clearly indicating that they could XYZ which is pretty impressive capability for a tank. (Self-censored)