I bought a 3 pack and have never had a problem with them. To get them to turn off all I do is but the nock on the bowstring turn it a little then turn it back so that it lines up with the fletching and it is off. I have also had them light up everytime I shot them. The only problem i had is I was shooting them on a very bright day and forgot the turn one off.
I don't know if I will use them next year yet or not, but I have nothing but positive feedback after using them.