Medela PISA or Freestyle?

ChestyLaRoo

I was EXTREMELY excited to find out that my insurance will cover any Medela breast pump 100%.  I'm trying to make the right decision.  I am going to be working full time and hope to exclusively breast feed.  For this reason, I understand that a dual electric pump is really the only way to go.  In Medela that comes down to either the Pump in Style Advanced or the Freestyle.  I have read both positive and negative reviews on both, and was just wondering if anyone on here had any recs or were familiar with both models.  Thanks!