After using my S10R for a few weeks I can add some comments, both + and -.
+Bright/small. For the size, the brightest of this batt. type I could find in fact, that had a side switch. I'm using it as a keychain light; ok so far but definitely a little on the big side.
+Charging base, and includes everything you need.
-The side switch is hard to find by feel. Try it without looking and you'll find your fingers don't find it well. The hexagonal flats around the tube aren't needed and getting rid them would make locating it much easier. As would a surface feature on the button itself.
-With winter gloves on you can forget about both finding and using the switch. This consideration would be an advantage of the twist-head (or some other) design!
-I find Low (not moonlight) too low and not useable for walking for example, but Medium is too much.
-The low-batt. LED only came on in high mode and light shuts off very soon after. Not overly useful. Threshold should be raised a bit and once it's crossed, LED should be permanently on in all levels.
-More of a general comment but some of the user interface I don't agree with. Holding to change modes namely is really annoying IMO. OTOH having direct access to max and min levels is v. good.