The Halo rangefinder from Wildgame Innovations is a decent one for the money. My brother has one and it does what he needs it to do, however it does not have an angle compensation feature. The angle compensators are not worth the extra money you are going to pay for the feature, unless you are shooting at very extreme angles, (i.e. a deer literally underneath you which is an ill-advised shot anyway with a bow). For 99% of the shots you will make there will only be a difference of a couple of yards. For example, fifteen feet high and fifteen feet away, your aimpoint difference is two yards which equates to the arrow impacting roughly 1/4" higher than the aimpoint.