I also love my Vlocity, really durable and the batteries are good but if you are using a rampng format you need to put the force up to 2 so that it can consistently keep up with the feed rate. This can effect the battery life quite severely though. If you are using semi then you will be fine on 1 most of the time unless you are maybe playing back and really need to rip the gun alot of the time.
I have also done the DIY big mouth mod on my stock stoke shell which is great, I also decided to slighty sand down the rim that holds the lid down when closed so it now pops up really easy.
Overall great loaders haven't need to use my reloader b for ages