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Base sizes are critical to the balance inherent in the game - if you start radically changing them it can give a real advantage (or disadvantage) to one player.

Broadly speaking though: bigger = worse. It's a common gripe of people who want to field huge GW dragon models that they suffer from a competitiveness perspective.

All of the above said, I can't think of anyone I've played casually who would strongly object to (much less refuse to play) some slightly bigger unit bases, especially if they're just a bit deeper.
In most circumstances a bit of extra depth on some units is unlikely to affect a game's outcome - and if it did, it's more likely to be to your detriment.

Tournament play is a different matter, and I suspect most TOs will take a firm line on unit footprint.

Wartopia wrote:

 Wafflecakes wrote:
Base sizes are critical to the balance inherent in the game - if you start radically changing them it can give a real advantage (or disadvantage) to one player.

No, they're not, at least if it's matter of 100mm wide infantry vs 120mm wide infantry or 125mm wide cav vs 120mm wide cav.

We know this to be true because even mantic used 120mm wide infantry and cavalry unit for KoW Historical. They're in the photos in the book!

They definitely are, and if you haven't played a few games with orcs/salamanders (25mm base sizes) I'd suggest giving it a try to appreciate the big impact to manoeuvrability from larger footprints.

What is or isn't in pictures in a book doesn't really change that.