I bought a titanium D25C about 4 years ago but didn't use it hardly ever. Then my edc light's switch broke several months ago and I decided to carry the D25C. I'm not a big fan of it. The older models only offer 2 modes when using a 16340, which meant I had to use CR123 to get all modes. The problem is that 2 of the 4 main modes are almost identical in brightness, and the titanium D25 has no lockout ability, plus it seemed to drain the battery at a high rate considering I used mostly low and medium, and never kept it running long. Possibly the most annoying issue are the 6 or 7 different strobe and SOS modes, which get in the way of the other regular modes when you cycle through the setting. It's possible that the newer ones are different than the 1st gen. I stopped carrying it after about 3 months approx. I liked the Zebralight SC52 better, but lost it after 3 carrying years, and I liked the Spark SL5 until 1 of its 2 identical switches broke. Now I'm still 'lugging' my SC600 mk1 around in my back pocket. I love it, except for the carrying part! It's just 1 more object in my pockets that keep causing pants-saggage! I need a more robust belt to keep them up!