Well, despite the well thought out and documented shortcomings of this "too good to be true" cute little bugger, I bought one on Amazon ($79.98 w/ free 2-day shipping for Prime members). I viewed the higher priced option (vs. Bangood or Ali, etc) as a sound insurance policy.
Have had it for two days, it goes back Monday (9:00 Saturday night right now). While it does indeed have a 100MHZ bandwidth (mine actually had 3 to 6 dB gains at 60 to 80 MHz; v. 10 MHz);the "single" and "normal" trigger modes suck to the point of uselessness. On a triggered sweep scope the "normal" mode is supposed to trigger as configured (I.e. "triggered sweep" as opposed to timebase fired "recurrent" sweep 'scopes we had to use eons ago--this is this unit's "Auto: mode); show one sweep; and then wait for another valid trigger--this thing does not, it just seems to trigger randomly resulting in a useless display.
"Single" mode forces the trigger position to he far left of the display (as does "normal" mode), seemingly off-screen on some signals, "chopping off' the trigger event. Here is a "single mode" capture of 1 kHz, 5 cycle burst:
Note that 400 us or so of the first of the 5 cycles has been lost; and as the trigger position is frozen to the left of the grid (in both "single" and "normal" trigger modes) it cannot be viewed.
It's too bad, as with proper firmware this could be a very nice little device--however as it is its just a giant step backwards to recurrent sweep 'scopes made obsolete by the advent of triggered sweep.
FWiW mine is the newer model with the TFT display and 3000 mAh battery; the display is great (my photo does not do it justice) anf I ran it 8-1/2 hours on the battery while playing with it--unfortunately "plaqying; is the correct word as as it is all it is is a pretty neat toy...
Also FWIW here is a capture of the same 5-cycle burst captured with one of the ADS2050H 5 Mhz/ 20Msps instruments; note that all 5 cycles were captured, though a bit more pre-trigger capture/display would be nice...
Bottomline: "If something sounds too good to be true..."