1. It's often fun and always useful to experiment with new products, but that usually costs money. You have a chance to experiment on someone else's nickel. That should be viewed as a welcome opportunity.
2. New heads of almost any brand and variety generally will sound better than old, beat up heads of almost any brand and variety. If your current heads are worn out, then these probably will be an upgrade. If your current heads are relatively new, then you could always wait until they're old.