AP shipping works really well. I make AP lids and armor for people, and my shop is wide open, so if you order a built kit
you'll get it much faster than a 8 month wait for ATA.
getting into armor is very expensive, and usually requires lot's of extras,
AP armor is much better quality than some armor's around, and with little to no wait for production and shipping.
SDS armor and helmets are usually frowned upon around here, since we feel his quality standards
and methods of construction are not as we need them to be.
I personally think that AP and SDS are very close to each other, with the AP helmet being tighter, and more well shaped.