Thank you guys for all your input. After hunting the weekend next to my buddy that has the kaibabs I will be keeping my swarovski 15's. I was able to start glassing earlier than him in the morning and later in the evening. I was also able to make out antlers at longer distance's but still couldn't tell how good the buck was till I closed the gap a little witch in normal at the distances we were able to glass. Guess I'll keep saving for a good spotter!