M2XC4 is a complete dissapointment.
First of all it is not "small," especially compared to something like the M30 Triton, in which case the M2X is slightly shorter when standing, but is thicker, bulkier, and heavier overall. It's only "small" when you compare it to something like Surefire's M6 Guardian, which it is smaller and brighter than, and also at least 10 years younger than. And all of the weight is in the head, which makes the stabbing motion (as if to nail an aggressor with the striking bezel) feel awkward and unpowerful, unless you're actually holding the light by the head and not by the hilt.
The 5-mode selector ring has no selector tags painted or engraved into it so you basically just have to guess until you can get the feel of it.
Oh, but it is very sturdy, I'll give it that. So sturdy, that I can't even get the last two screws out of the back of the tailcap to install the optional M25 clicky switch. In fact, they're in there so tight that all my screwdriver can do is grind metal off of the heads of the screws. They're not coming out, ever, period. Why it doesn't come factory pre-installed, I have no idea. The "optionability" of it makes absolutely no sense, because the light is tactically useless without it. As the resident of a large city with a notoriously high crime-rate, I would much rather have a flashlight that I can grab from my pocket or holster, click on, and maybe strike with, at a moments notice - as opposed to a light that I can grab and aim, and have to divide my attention between a hostile target and the selector ring on my flashlight, even if it is only for 1 second. Tail standing is not important to me - that's why I have reliable electricity.
In short I would think about sending it back but the damage I did to the unscrewable screws probably voided my warrenty.