Are there other advantages to using turf over grass seed besides getting instant results?
I've looked at this in the past.  These two links are pretty general, but each has an interesting tidbit.

Link 1 "If your yard has especially shady spots, you might be better off seeding those areas, since most sod is made up of sun-thirsty grass varieties."

Link 2 "A prime disadvantage of sod is the limited number of grass species included in sod mixes."

Other than that, sod is a clear winner if you have more money than time.  I've done both, killed both, and revived both...lets just say I'm eyeing my neighbor's lovely rock garden with a bit of envy.