This is a great recipe. I've been making it for years, really from the time it was published. I take it to pot-luck parties and people are always amazed by it and want the recipe. I follow the recipe except for adding the mint and parsley, and that's only because I don't plan in advance when I'm going to make it and just don't have it on hand. It's good with and without. As far as the comment about the Balsamic being overpowering, I've never run into that, but I have found that there are some pretty bad varieties out there. We really like Costco's Kirkland brand, never had a complaint about it.
I made according to the recipe with the exception of adding chopped tri-color bell peppers and replacing rice with orzo. The balsamic was a little overwhelming so I would add less next time or try the red wine vinegar. I served with grilled chicken tenders.