I am currently building up my German vehicle collection for Airfix Battles (my son is doing the British). Unfortunately Airfix most of the military vehicles are absent from Airfix stocks at the moment so it is a case of picking up what I can.
The Panzer IV is one of the later vehicle toolings (1970) and this was nicely rendered in the usual modern grey styrene rather than the green which is common in earlier issues. It has some nicely rendered details for the tools, though purists like them seperate at this scale the integral mouldings are fine. As usual the running gear is a little fiddly (though I have encountered worse) and the vinyl 'rubber band' tracks don't sit all that well (I didn't try painting them as they take paint very badly).
The only fit issue I encountered was the undercut sections on the rear of the hull which were quite tight (though I fitted them after putting the hull top sections onto the main hull so it might be easier to assembly the complete top hull before fixing it to the base. Otherwise it went together well and has very little flash. The only addition to the 'out of the box' build was a commander in the cupola (an airfix German Paratrooper with his arm in a sling) and the whip aerial made from stretched sprue. The decals were 21st Panzer Division from The Plastic Soldier Company for unit consistency with my other vehicles. Due to limited availability it operates alongside 1/72 Pz IVs by Armourfast. However the scale difference is not that significant for wargames purposes (mainly height which makes the 1/72 version look more 'chunky').
Given that the Pz. IV was the most significant German Tank of WW2 it ought to be front and centre of the range (along with the Sherman, M3 Half Track, Sdkfz 251 Hanomag, Sdkfz 222 and Puma Armoured Cars and Cromwell, Panther and Tiger 1). The new Cromwell is very nice and ought to be joined with similar new tools of the other major vehicles of WW2 to generate cross sales with the Airfix Battles game.
Photos below were taken on the Airfix Battles maps and show the AF 1/72 version side by side to show the scale differences.