My Edifier X3 have arrived.
Quick pros and cons list so far:
Pros
Case is perfect, I've been dying for a case this size, properly pocketable, fits in the pointless small pocket in jeans (the Linus test) and leaves enough room to fit a finger in and fish it out.
Buds fit in the case with my medium Spinfit CP360's and medium Sony hybrid tips on AND charge properly, so a small set that also fits (some, I'm making no guarantees!) third party buds, finally! And of course it's somehow the one with the smallest case.
Sound generally seems pretty nice, they're bright with a nice bass thump and they can get seriously loud.
Build quality seems good. The lid on the case is just plastic hitting plastic but still manages to feel pleasantly snappy rather than cheap, hinge feels solid.
Video latency seems as good as most TWS these days (I.e. pretty much perfect)
Fit and comfort is also good, always helps when you can tip roll even if not every set are going to fit (I'll try some longer ones tomorrow and edit the results in). They're quite round too so fill the ear and provide good isolation.
Cons
As far as I can tell there's no AAC which is a bit annoying as a mostly iPhone user these days.
No volume control, but the touch controls outside of this seem to work well, it has one of those all in one bud setups so both buds can control play/pause/foward/back/assistant independently for mono use.
Micro-usb, boooo!
They have a little blue light on each earpiece that blinks every couple of seconds, not an issue for me but could be annoying for those who want to use them in bed.
I'd say a pretty easy recommendation so far, especially if you pick them up when they're £15/$20, they're a perfect cheap gym pair to slip in your pocket (they're IP55 rated too which is nice)