I don't know where you get the negative opinion from but mine is awesome. If you read, understand and use the unit correctly i have found it to be bang on.
I worked up a load using 180 bergers in a 7 mag, chronied it and was happy with it. It was zeroed at 200, I used it for my 600 yard drop and it was right on- I mean like right on. Then on a different day I set up at 970 yards and it was bang on again. First round hits at 970. What's not to like? You can even update your muzzle velocity at different temps and it will approximate that for you when out in the field. If I hold it into wind it will take readings for the min and max and give you two wind holds. If you leave it on while shooting long distance you can see the elevation adjustments change in real time-not much that it matters but it is doing its job. I used my old come up chart at 650 and was off a bit, I referenced the Horus, adjusted and was back on. I mean I was only about 6 inches off but the Horus gave me the corrections that would of put me on in the first place.
I was a bit hesitant to fork out the cash to begin with but I'm glad I did. It works fast and you don't have to input the info into your phone. I wish I had been doing that though so I could give you real world comparisons of the solutions with shooter.
If your going to get a kestrel anyway I would say its worth the extra money
