Jackie and I always ride the Spring Solvang because its good training for the Solvang Spring Double, which is usually two weeks later (haven't checked for 2008).
I actually like the Spring Solvang Century course a lot, good variety in terms of climbs and flat bits, plus excellent scenery. Checkpoint fare is okay/adequate, but certainly not wonderful. Temps vary dramatically from year to year, but the one thing to keep in mind (at least I do) is that the worse the conditions are, the better stories you have for the years that follow!
Rick / OCRR