I have been using the trial version of Nectar which is currently going for $199.   I like the vocal doubler (tripler, quardrupler), I like the de-breather, I like the interface, but I AM NOT IMPRESSED BY THE PITCH CORRECTION FOR TWO REASONS:
 
1.  When in automatic mode, I hear artifacts that do NOT occur when using Anatares Auto-tune on the exact same audio.
2.  When in Capture/Edit mode, Nectar and Sonar are NOT SYNC'D UP so it's bloody useless.
 
I was wondering if these problems could be related to using a trial version, but that doesn't actually make sense since it's a full version without authorization past 10 days.
 
Is Nectar worth it?  Who is using it?  does it Sync to Sonar?  Am I doing something wrong?

In V-Vocal, trying to adjust too long of a clip causes weird sound issues, and I am wondering if the same sort of thing might apply when using Nectar.
 
Can you try to run a shorter bit of audio through the corrective process, and see if that helps?
 
Bob Bone
 

I like and use Nectar, but not so much for pitch correction.
 
Melodyne, Melodyne, Melodyne.

After using the demo for 10 days, my opinion is that Nectar is NOT READY  for prime time.  If the auto-tune worked better, I might feel differently.  I will be either upgrading antares, or buying melodyne.