My first one was troublesome. It flickered intermittently rather easily on the low mode. So I sent it back. A month or two went by and I hadn't heard anything from them. Thankfully I sent it with delivery confirmation. I gave them the tracking number, they verified it and then sent me a replacement.
The new version looks nice, having anodizing in two shades. I popped in the batteries and it worked just fine. For a while, that is.
If you lightly rap the head with your hand, it cuts out. I took it apart and the head contacts seem fine. The tailcap battery spring seems to have enough tension. What's the deal? I saw someone mentioning using 8mm magnets to increase the battery contact tension. Since the forward end of the battery tube is just a metal disc, would that be the optimal location for it? Does the 8mm magnet solve this annoying issue?