I've got a couple of Luna Pro SBC's with the 7/15 degree attachments and a 1/5/10 degree spot head. The spot head stays on a meter in the large format trunk, for medium format I use whatever is appropriate for the scene I'm shooting. Incident, reflected, or the tighter 7/15 degree "spot" head. I've been tempted to get a newer spot meter just to have a smaller one, then I think of the size of the trunk all the LF gear is lugged about in. If I was a backpacker it would be a different story though.