If you use the old range of
GW paints, the VGC range is probably a better match than the new
GW range. I'm a fan of vallejo paints, use VMA, VGC, VMC and Vallejo liquid gold. I'd recommend you jump over, but be prepared for it to behave differently and take a bit to get used to. Might need to shake them more, or use additives like drying retarder or flow aid and thin with a different quantity of distilled water to what you do with your
GW paints.
Here is a paint range conversion chart on dakka comparing old-
gw to vallejo and some others.