Thanks. Good info to know.We've changed our pricing to include halo if the bow requires it. We were getting 30-50 phone calls a day asking the differences and it was eating up alot of our time so it is now included. I would like to add that just because halo is more expensive doesn't mean it is a better choice for every bow out there. We have found halo to not work as well on certain bows while it is an absolute necessity on others.