Hi Brian,
To answer your question regarding the Nitecore vs. the E1B: As luck would have it, my Nitecore D10 and my SF E1B are the only two pocket-edc lights that I own, so I do use them a fair amount. Of course saying this is a classic cookie cutter response, but both lights have different uses. To make it short, if price in fact was not a factor, I would have to pick the E1B. The E1B is the light that I EDC, while the D10 is mostly on backup as a good household/work light (because it can tailstand, has floodier beam, and can be held in mouth easily for working on car, etc). The main reason that I choose to EDC the E1B over the D10 is the excellent throw of it's total internal reflection optic:rock:. This allows me to see far ahead of myself when walking at night, and prevents me from flashing people/houses/cars with excessive side spill due to the tight beam (also, even if I am shining the light far away, there is enough periphal lighting to easily see what is in front of me. Of course, flood is also majorly useful as well, which is why I carry the E1B with the F04 diffuser. Overall, the E1B seems to have a little less output than the D10, but because the beam is so nice and tight, its output does go a long way.
To go into a little more detail, I am going to briefly glance over some of the merits and drawback of each light. Keep in mind that I naturally will have some biases, so your mileage may vary.
NITECORE D1O (R2 EMITTER):
Positives
- Uses AA batteries, can use rechargeable L-ions, NIMH, etc.
-very small and pocketable (smaller than E1B)
-has aggressive knurling over entire surface, very grippy
- aftermarket clip is nice add on (E1B's is better though)
-great output for its size (overall, seems to have slightly more output than the E1B when run on 14500 lithiums)
- beam is mix of flood and throw (uses traditional reflector)
- piston drive is innovative, nice to operate; feels sturdier than rubber, silent
- UI is simple and very usable, offers wide range of light levels
-light enough to hold in teeth for prolonged hands free operation
- can tail stand
- many water bottle caps fit over bezel exactly for fantastic free diffuser options
Negatives
- does not throw as far as E1B
- finish is not as solid as E1B (mine is a few months old with chips in anodizing)
- doesn't look as "cool" as E1B (this is completely subjective)
- beam tint is greenish, not as nice as E1B (again personal preference)
- piston drive does not operate as foward clicky unless in lock-out mode
- ramping up is much faster than ramping down for me (most R2s?)
- can be hard to "catch" desired level of light while ramping (both up and down)
- looks, feels cheaper than E1B (makes sense at half the cost!)
SUREFIRE E1B
Positives
- backed by great company with great lifetime warranty
-just looks freakin cool!

- amazingly overbuilt/overengineered build quality
- good weight, feels very sturdy in the hand
-because the body is smooth, it goes in and out of pockets easily
-the two way clip allows you to clip it bezel down in pocket or on belt as well as clip it to the brim of a cap bezel forward as an impromtu headlamp
-TOTAL INTERNAL REFLECTION OPTIC = GREAT THROW :rock:
-does light periphery despite focused beam
-beam tint is a very nice white, do not detect blue, green, etc.
- great paired with an F04 beam diffuser
- extremely effective and simple two level interface (low, high)
- the low, approx. 5 lumens, is impressively usable because it is tightly focused
- foward clicky with good switch action
- good runtime
Negatives
-cannot tailstand
-not as grippy as D10, can feel a little slippery at times
- definitely larger/thicker than D10
- some people dislike that high comes on first, followed by low (i personally like it as it is)
-little bit too heavy to hold in teeth for extended time period
- seems to have slightly less output than D10 on 14500 lithium AA
- less light output options than D10 (though for me, I only use high and low on the D10 about 75% of the time anyway)
-can only use primary CR123's
Well, that turned out to be just a little bit more than brief, but I hope I helped.
Good luck!
JonM
PS. Get them both! :naughty: