I like the DGX MAX (I think the mag switch is an improvement over the DGX 600, but otherwise the same light). I carry both a spot and the video wide angle. I spend a lot of time in dark places looking for Lion Fish and sometimes the softer defused video light can be used to prevent spooking them as a tight beam sometimes does when hunting. The narrow beam works great for looking into holes in daylight or on night dives. At $50 with rechargeable battery and charger it is pretty competitive with the other general purpose lights out there.
I had a DGX Max and a DGX 600. The Max died for no apparent reason after I'd only had it for 2 months. DGX replaced it, no problem, and, at my request, gave me another 600 instead of a Max.
I got the Max because I thought it would be nicer to have a light I could turn on and off with one hand. But, the Max twist ring was just stiff enough that I usually could not turn it with one hand under water (i.e. wet, possibly with gloves on).
Also, the on/off ring on the Max did not have anything to really let me distinguish it by feel. I had to actually look at it to make sure I was turning the correct thing. I tried to turn it on once without looking and realized I had turned the light head and not the on/off ring. Fortunately, I did not turn it enough to let water in. It was numerous dives later that it actually turned up dead.
Also I note that SOP is to turn the light on before unclipping it from the harness. Turning the Max on (using only one hand) while clipped to my harness was even more difficult. And, seeing the light to be sure I was turning the on/off ring and not the light head was also sometimes challenging with it still clipped to my harness.
If the light is going to require two hands to turn on, then I'd rather have the bulletproof simplicity of the 600. Not to mention the 3 O-ring seal on the 600 seems like it might be more reliable than the 2 O-ring seal on the Max.
The 600 may require 2 hands to turn on, but it is certainly easy to do, and do so reliably, with it clipped to my harness.
Maybe I got a bum Max. Does your on/off ring turn easily using just one hand to hold the light and turn it on?
---------- Post added November 16th, 2015 at 05:15 PM ----------
I have 2 of Archon d11v (or some version of it) that i use with my gopro.
I also have a D11V for use with my GoPro. Like Storker, I don't find it very useful for signaling. And I do wish it was on/off with only one hand. But, for the same reasons mentioned above, I like it better than the DGX Max (wide angle) for video use. And I like that the D11V allows you to turn it off and back on quickly to change the mode from High to Low to Strobe.
And the D11V is the same LED emitter as the DGX 600, DGX Max, DRiS/HOG Morph, etc.. So, it puts out a pretty good amount of light for a small light with just one battery (an 18650).