Here's some good threads on the X3:
Intro from Hank: https://budgetlightforum.com/t/-/19456 (350 posts)
Early preview/review/many follow up coments (_the_): https://budgetlightforum.com/t/-/19956 (153 posts)
Review (leaftye): https://budgetlightforum.com/t/-/20211
Internals review, Mod thread (mine): https://budgetlightforum.com/t/-/20644
Drop Test: https://budgetlightforum.com/t/-/26925 (Ouch! This boy is sic!! 
)
fyi... I didn't mention the indent on the pill top this light had. I dunno if it's still there in the latest batch's. First thing I'll do when I get mine is check for that. With the mod I did of filling the gap with copper and AS5, it didn't seem to hurt much - it got high lumens and held it pretty well, so couldn't see signs of it, though I didn't do extensive tests. From experience with bad star mounts, I would see a more significant drop in lumens during the first 30 secs.
Update: Order placed for qty 2 (discount was given for both pieces)