BUT
Audience: Gasp!
Once the falconets are gone, what do your culvs do? Well, nothing. They can deal 30 dmg (without the -10% armour or whatever from what you're shooting) to enemy infantry, or 15 to enemy cavalry. Abus guns, however, can own enemy infantry and (even though they still suck) deal 20 damage to cavalry, more than a culverine. They also require a smaller meatshield, as you can very cunningly simply make your abus guns stand in the middle of a group of jans and voila! enemy cavalry cannot get them. (I'm not talking about the guard formation, literlly make them stand in the midle of a group. Sometimes your enemy won't even see them).
Abus guns are also not affected by that stupid bug that makes artillery go in and out of limber mode instead of shooting. This is because they are just too damn cool to be affected by anything negative.
The disadvantages are of course that they do not have the range of culverines, and 10 abus guns takes twice as long to produce from the foundry than 3 culvs (though you gather what you need faster, so it might even out. Probably not though
* a star indicates a fact I have made. No testing was involved in this topic at all.