I've never sealed ours in 17 years, and trust me, my wife spills red wine on it regularly, not a single stain on it.
Agree...this is near white Quartz and has everything from red wine and ketchup on it (sometimes overnight) and there isn't a hint of stain anywhere. Never been sealed and we don't "Baby" it.
I like the mitered edge on the island; don think you can get that look with granite?