I have a Drummond manual shaper, so time was rather irrelevant in my case.
One advantage a shaper has, is that the finished surface is flat – no worries about tramming the head.
I’ve not done anything on the shaper for over two years and likely never will, now, but I enjoyed working it, on small parts, when I was able.
A more appropriate machine for internal keyways than bumping the vertical head (or lathe carriage) up/down (or back/forth).