After having mine for a couple years I' ve found that it pays to have two of them. You have two ears to hear in stereo. With only one you' ll have a hard time telling the direction sound is coming from. This is where most guys go wrong. They buy one and then can' t decifer what they are hearing or where it' s coming from so they automatically figure the darn things don' t live up to their billing. What they are doing with one is hearing two different sounds and the brain can' t figure things out. I know this from wearing hearing aids for 20 years. They may not be the best solution going but I haven' t found a better one yet. I have about a 40% hearing loss so wear two hearing aids that cost me $5100 and for hunting the Game Ears do a better job. It has to do with the frequencies they amplify. Rustling leaves or deer walking is high frequency very low volume sounds and the Game Ear II is frequency adjustable for this.