Depends on how upset you get over missing that shot....No really, it makes it so much easier to know that your bow is dialed in to what your range finder is saying instead of estimating. Depending on your rig; at 40 yards, 6 or 7 yards difference could mean several inches in drop. If you decide to get one, I would highly recommend one with an angle compensating feature. TBR, ARC, etc....
I've saved a bunch of lost arrows at various 3D ranges by using my rangefinder. It also made me much better at estimating ranges, especially uphill and downhill. With a rangefinder I'm confident and shoot small groups out to 60 yards. Without a rangefinder I pretty much limit myself to 30 yard shots in circumstances where I might lose an arrow. There are other methods to estimate range (pacing, taping etc.) if you shoot from a stand. A rangefinder is much easier.
Shooting a bow at 40-50 yards isn't the same as 10-20 yards, At 20 yards you can be 5-10 yards off and still hit your target. You can't get away with that at 40-50! Knowing your yardage is the most important aspect of making a good shot!
I personally think a rangefinder is more important than binoculars. At any range I would concider a shot with a bow I can see fine with the naked eye, but knowing the range I'm shooting at gives me confidence and increases my chances of making a clean kill.
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