Over the time I've been around Pitbull, very few kits have gone out of stock and not come back in and when they do, Ads removes them from the shop, so I don't think there's much difference apart from what felt good for Adam at the time they ran out. Adam has indicated that there is a shipment that is a couple of weeks away from delivering, following a delay in getting the shipping container out of China due to COVID. That will probably see a couple of the more popular kits back in stock. As FrankenWashie has indicated - drop Adam a line and talk custom if this is where you are thinking - he's been doing this for a while and will be able to tell you what the factory in China can / can't do.