CONS:
It only supports G1 BC (i.e. ballistic coefficient). While the G1 BC works well for shorter, flat-based bullets, a G7 BC works better for longer, boat-tailed bullets. If you are calculating the ballistics curve for a modern, long-range bullet, then using the standard G1 projectile to do that simply can't give you an accurate curve beyond about 800 yards. I ran the ballistics in JBM for the load I shoot using a G1 BC and a G7 BC will give you a difference over 1 minute at 1,200 yards. That means the trajectory adjustment it suggests would be off by 14″. That's enough to miss a shot. Then at 1 mile, it's exaggerated even more with a difference of 2.5 MOA, which means your impact would be off by 46 inches! I have to believe one of those manufacturers will do it at some point. My bet is on Bushnell or Leica.
The rangefinder only displays adjustments in whole numbers, without decimal places.
It only supports displaying the adjustment in either inches or MOA … not MIL.
It doesn't allow you to set the sight height for the ballistic calculations. That is hard-coded to a constant value of 1.9685 inches. This probably isn't a big deal, but it's kind of lame. Why?