I personally sold my old 15's and bought the new HD 15's. Couldn't be happier and very worth it in my opinion. There is a significant difference in reduced glare when looking toward the rising or setting sun and they are a fair bit more crisp edge to edge. I've hunted with people that have every top tier 15X glass and for now, I don't think they can be beat. Now if you're really looking for the best, get the 95mm spotter with the btx dual eye piece. I almost regret looking through my buddy's... I fear that little stunt will most likely cost me a pretty large chunk of change.