The PC25 has a slightly wider than average head which allows it to accommodate a larger reflector. A coated mineral glass lens sits up the front which helps with light transmission. The reflector has a very light texture to it. Surface finish on the reflector is consistent and well polished. The LED sits perfectly centered at the bottom of the reflector cup which ensures optimum focus. Externally the head has a number of machined design elements which are mostly for aesthetics. Though the battery contact points don't have physical reverse polarity protection, the electronics of the TC25 itself has in-built reverse polarity protection. Threads between the head and battery tube are of the standard variety and not square-cut like some other JETBeam models. They mate well with no cross-threading, although they do feel a little rough.

The battery tube has a plain cylindrical tube design and accommodates both CR123 and protected 18650 cells easily. Since the battery contacts have springs on both ends, flat-topped 18650 cells can be used with no need for magnet spacers. To the rear, there is a removable grip ring. When the tail cap is fully tightened, the rings sits firm and secure. However because the grip ring isn't screwed on the battery tube, it may wobble a little when the tail cap is unscrewed for battery changes. This isn't really a usability issue, rather just a minor irritation. Obviously it can be removed if you don't which to use it. The tail cap has the main interface feature of the TC25 which is a dual switching interface. There's the main forward push button switch on the rear end which serves the traditional function of switching the light on and off, while the side-mounted push button switch serves as an output mode selector. The rear switch has nice stiff tension with average travel and tactile clicking feedback. The side switch on the other hand is a toggle switch.

If you're unfamiliar with any of the terms used in this review, click here for explanations on common flashlight related vocabulary.

The PC25 has a total of 4 constant illumination output levels, plus a tactical strobe mode which blinks in random frequencies. Output selection is controlled by its secondary push button located on the side of the tail cap. It cycles output from Mode 4 (dimmest) through Mode 4 (brightest). Whichever output mode last used is memorized the next time the light is switched on. To activate the tactical strobe, simply hold down the side switch while the light is off. PWM is employed for output variation, thus some of its effects can be noticed when waving the light around. However in most practical situations, this doesn't really pose any issues. The beam profile has a narrow hotspot area surrounded by a very wide, soft-edges corona region. Overall beam profile is clean and free of any noticeable artifacts. Color temperature is neither noticeably cool nor warm, a nice neutral white.

The PC25 seems to be more efficient when running on 1x 18650 than 2x CR123 as illustrated by the runtime graphs below, albeit with looser regulation. However, output from 2x CR123 cells is slightly brighter compared to that from a 18650 cell. Runtime performance is on-par with other recent XM-L based lights as well. As the battery runs out of power the PC25 will start to flicker as a reminder to swap out a fresh set.

The Good - Dual-switch interface clearly separates activation and mode switching. Relatively bright.

The Bad - Regulation on 1x 18650 cell could be better.

The Relative - Clean beam profile with a neutral white tint. Forward push button allows for momentary activation. Is able to tail stand.