I must admit it does look like there's less in the taller vials but I'm presuming it's an illusion because the vials are taller so don't look as full as the original "dumpy" vials . I don't know about anyone else but I usually draw 1.1 or 1.2 ml into the syringe to shoot , to make up for the leftover oil that's usually left in the barrel of the needle after shooting , that way i know i'm injecting exactly a ml so I do get through a vial a wee bit quicker . Anyway I'm not going to kick off over paying £13 for 8ml as opposed to £25 for 10ml from the usual vendors . At the end of the day it's still ridiculously cheap , great gear , and Jeri's friendly and reliable so it's all good to me . I've made him aware of the situation and I'm sure he'll reply in due course