These are a great product. I learned about them from a friend of mine that owns a long range rifle manufacturing business and runs long range shooting schools. They are awesome. The glass is top quality that will compare to all of the best name brands and the range finder is great too. For guiding those are the 2 features I use constantly. On the personal hunting side I love how I can input all of my gun/load info and they give me spot on calculations on my MOA hold over. Spot On! and you can blue tooth into the app to switch which gun you may be carrying.
I have used these from the Yukon to Mexico and they are worth their weight in gold.