My smaller scale Cold War stuff is all Irregular 2mm, some the sculpts are very nice indeed (Chieftain, BMP,) and some are just sort of generic (trucks and jeeps). They are all a fair bit smaller than 3mm though, with some curious gaps in the ranges. It takes quite a while to file down an Sdkfz 222 so it looks like a BRDM, but it is fairly quick to cut down a Warrior into a Scimitar.
I'm happy enough with them though, they multiple base up fine and tbh from 2 feet away they are all only tiny green blobs anyway.