Jim, I know folks here have varying opinions on waistcoats, but having one now I think I really like them.
It kinda broadens the use of the jacket. In fact a fellow kiltwearer came to my office today to view the jacket and said he liked the option of waistcoat and kilt even without the jacket. I agree.

It's a bit like two coats for the price of one.
the fact that scottishkilts.net offered the two as a package made me go for the deal.