Press pack or injection, a poorly made denture is a poorly made denture. If your occlusion sucks, you're going to have issues. If the model sucks, you're going to have issues. If you have assembly line production its only going to be as good as the weakest member of the team. There are a ton of other factors going into these than denture base. I've said it before I press pack and have happy clients all day long for years, and I've repaired several ivocap with cracks and tooth pop offs that are newer dentures, if the lab can't make a good product, denture base doesn't matter, fwiw.