not at all... like i mentioned, similar or acceptable batts..."...not a lot" actually there are alternatives that fit within superT's criteria... basically a decent brand of batt that is IMR or similar to the IMR... if you know the criteria, I don't, but i know there are some terms i recognize: "hi drain" ... "safe chemistry"... a certain amp load capability and more.
I wouldn't turn my nose up at an Efest batt... there's some newer and not so new batts that member bishopeals for one, documents in his threads.
Yea the Efest seem to perform on par with AW IMR's.I have 8 Efest 18650's in rotation,2-2000's(flat top),and 6-2250's(button top,the buttons come flush with the top of batt so they might as well be flat top),and 2-each of the 500's and 350's.As you can tell,i tend to run my PV's in 650 mode quite alot.