I come from riding a Goldwing. Initially I too was concerned about the smaller size of the VV saddlebags, but as others have said they are larger than they appear. I have taken several trips and had no issues at all packing all that I need and more. I can pack practically as much in the VV as I did in the wing and see very little difference in total storage capacity.
Don't let the bags hold you back. When you look at them the first time, you will think they are small, but notice how deep they are.
You'll be fine.