I've skipped two years, I'll be sending it back this year. I will say though, it hasn't skipped a beat. And I am not nice to them, I almost never rinse them... but they still do their job without complaint. That's why I don't think I'll ever buy a Z.
Before the flames come down on me.

I'm not saying that Z's are bad, I'm just saying I'm happy with my VS's.
