The heads look a little odd in the metal shots with the flat top but they look great in the painted shots. I'm very tempted.
Agreed. I'm not a fan of the 'Flat Top'; reminds me too much of the Bauhaus Blitzer look of WarZone fame.
But since these are Pig Iron and the heads are cast separately we have options!!!. I have a lot of the Heavy Infantry style head sprues saved up for exactly this type of situation.

Not
all Pig Iron minis have separately cast heads. But the head-swap thing is a Pig Iron feature and I get the impression they work it into as many of the packs as possible.
The question is whether to buy straight off, or wait to see what else they have up their crafty sleeves for System Troopers?