I have the Horus and have shot it a lot in the field, but only on rocks and steel plates to date. The reticle works, gives you aiming holdoffs for about any caliber, range and wind condition - tied in with a neat computer program etc. If a person worked somewhat hard at it this system would be doable in the hunting field - takes learning and practice. You won't get onto any rangefinding system without a bunch of practice and more practice.
Fact is a 1200 Leica will tell you in about five seconds how far away most shots will be unless you really want to stretch things, no boogering around with dots, lines formulas or sliderules.
How good the scope will hold up is to be seen - this is a relatively new product vs the proven reliability of Leupold's scope that you are considering. You pays your money and takes your chances - I know that most guys on this board will say go Leupold and don't look back.
Just to complicate your life I would also look at the newly introduced and available Nikon tactical, and maybe for a few more bucks the NXS 3.5-15x50, believe both may be available from www.swfa.com