I got melodyne essential for $49 and I use it in Sonar, mainly on the backing and harmony vocals. I only got it because sonar's v-vocal always crashed on me.

I would love to have melodyne editor, but it is expensive (an on-sale upgrade from essential is around $149, though).

Wonderful tool, worth having in the arsenal.

Now at bandcamp: Crows Say Vee-Eh @ bandcamp or soundcloud: Kevin @ soundcloud