Just as jewelers maintain a set of "Master Stones" for purposes of grading diamonds, I have a set of ten AAA keychain lights that I use to "grade" any new AAA keychain light that I purchase.
The single mode UltraFire on the left is primarily a "spaceholder." I will eventually add another light, and since this plastic case only has room for ten lights, the UltraFire will soon have to "go"...
I realize that
HaileStorm has already made his decision, so this post is intended only as a sort of "hot wash." (By the way
HaileStorm, you really cannot "go wrong" with an E05, so I am sure will be happy with your purchase. It is a very solid single mode light.)
Personally, however, I decided long ago that I prefer multiple brightness levels on my own Keychain light. Assuming that your Keychain light is to be your "last line of defense against absolute darkness" then I prefer having something that can potentially run for many many hours (at low output). But, at the same time, for everyday convenience, I want something relatively bright. Therefore, I tend to prefer having Hi/Med/Low (in that order).
Anyway, my "Master Set of AAA Keychain Lights" are arranged left-to-right by price. I have a Fenix LD01 on the far right. I know that there are much more expensive and "better" lights available out there, but I am seeking the best value, so I am not likely to consider spending much more than $30.00, so long as there are lights of similar performance and quality out there that appear to be able to completely fulfill my requirements at a lower price.
Skipping over the "El Cheapo UltraFire," I have both a Thrunite Ti & Ti2. Both are nice (and seemingly reliable)
2-mode lights, but they are not necessarily all that cheap in comparison to some of the remaining lights, which are all 3-mode.
The next four lights are noticeably shorter than the rest, and I consider them to be "of the same form factor." Best I can tell, the Tank007, Olight, iTP, and Bronte, are all extremely similar lights. Of the four, the TANK07 E09 is noticeably cheaper, but I cannot find any significant differences in performance or quality. (Obviously, ability to tailstand, pocket clips, etc., varies with each model.)
The next two lights: Brythe and Balder seem (to me) to be Fenix LD01 "wanna be" lights. Their performance and quality seem excellent, but their price gets to be so high that you might as well purchase the LD01 for just a few more dollars and be done with it.