The proseries just makes it easier to make fine adjustments during tuning but honestly you really do not need to spend the extra money. I have used the hunter model with no problems at all. You just need to be a little more careful when adjusting your centershot because its possible for the angle of the lancher and therefor the height of the launcher to change. But if you pay attention to what you're doing, you won't have a problem.

The lockdown function is an interesting concept but I have seen no real difference between the lockdown version and the regular as far as ease of tuning, shooting accuracy or fletching contact.