Thanks very much for the thorough review, SD307. Let me try to contribute in a similar fashion.
My experience is through a Gen3 PVS14. When I had my vampire, I personally thought the IR output was plenty - I could easily illuminate 200 yards or more, and identify eye reflections in predators well past that. My biggest gripes were the horrendous white light output (it was blue, not very powerful, and lacked a good beam pattern) and the size/weight.
I sold it and bought a TLR-1 IR (IR only), and went with a M300A scout on my rifle (white light only). Just two weeks ago I found a screaming deal on a M300V, so that now resides on my rifle in place of the M300A.
Random thoughts:
TLR-1 IR: AMAZING IR illuminator. It throws extremely well for its size - better than anything I've used at this point. The spot is very tight and reaches pretty far. I purchased a Surefire F04-A diffuser and it works perfectly, turning the IR spot into a wide flood that is great for general illumination. It would work well for navigation on foot, or on an ATV. I run this on my helmet. Runtime is good at around 7-8 hours.
M952V: this was my first legit IR source. Never had any problems with functionality or reliability (and was affordable at $125), but it was big, heavy, and the white light output left me wanting more.
M300V: this is again plagued by less than ideal white light output, but at least the size and weight are ideal. the white light is slightly better in beam profile and color than my M952V, but it still isn't even as good as my 110 lumen white light only M300A. IR output is acceptable out to approximately 100 yards. If I need to spot further than that, I go to the helmet mounted TLR-1 IR.
Bonus:
Solarforce L2P host with Chinese made IR drop in: this was my first IR light source, and it only cost me about $40 combined. I ran it in a VTAC helmet mount, and it is great. Adequate throw with very good flood. It made riding an ATV on a cloudless night easy. The drop in runs on a 18650 so runtime is good, and I don't have to burn through CR123 batteries. This how now become a back up IR light source since acquiring the TLR-1 IR. Excellent bang for the buck (and this is coming from a guy that routinely shuns Chinese lights).
edited to add:
Double Bonus: forgot to mention my Surefire helmet light. It has white light, IR light, and IFF beacon. three lighting levels for white and IR light (IFF beacon is either off, or on).
The white light is sufficient for up close tasks on low (reading a map, checking your weapon, walking around in the dark without NODs). On high the white light is enough to light up a room of an average sized home.
The IR light is sufficient for navigating inside a dark building/structure on low, and on high will light up a pretty good area indoors (seems like it would be sufficient out to approximately 50 feet), or is enough to navigate a wooded/no moonlight area at night on foot or slowly on an ATV.
Great run time on low, very low profile solution for helmet mounted aid. Not very expensive (under $50 if you look hard) and it is light weight to boot. Should be a must have if you're running helmet mounted NODs. There are alternatives out there, princeton tec being a popular one.