Terminator Selects kick butt on Gold Tip Hunters for quality. They are straighter, more consistent in weight and spine, and more durable than Gold Tips Hunters. Only the Hunter XT's come close to matching the Selects for quality, and even they don't quite cut it.
The Terminators are quite a bit heavier so you'll lose a few fps of speed, but I agree with your dealer. You'll likely see better penetration with them.
Exactly my thoughts as well. Terminator selects are a much superior shaft than the Gold tips.
Just because they cost less does not mean they are of less quality. This is definetly one of he exceptions of the "you get what you pay for" way of thinking.