First one lasted half a box of shells before it dimmed or stopped working.. Removed and reassembled (including battery removal and reinstallation) two more time. Last time, five shots still it quit.
One week later replacement lasted three shots out of the original packing before the same problem materialized. Definitely a big problem.
I'll call CT to see what they say, but very poor reliability and quality control.
This review was written in the old system and had content requirements that are different than reviews written today.