All good things come to an end (sigh)
This second expansion that closes the Unity of command trilogy is as good as the two others iterations. You will find some battles more challenging, sometimes with few or no reinforcements from the high command that you can buy.
New specialized battalions add both flavour and toughness to units, like ISU-122 for the soviets or Tigers for the germans. This adding hours of pleasure to a game that was already surprisingly good despite looking simple at first sight.