Oh, Neil and I have talked....many times, even before I came to be where I am now!
We've done a few alder basses, and they sound good, not quite as "open" sounding as the Spanish cedar, but maybe a bit more "focused". I'd suggest getting in touch with Peter Parker, he's pretty "up" on alder as a body wood, and owns an alder bodied (with redwood top) fretless Century.