Except the specs are absolutely clear on what that mode does and what the accuracy is. There are no random variables like with certain Asian meters. It's not a useless gimmick like on the Brymen.
Let's put things in this way :
who will trust to PSU reviews where the output transient analysis is performed exclusively by Fluke 87V peak function, without DSO capture screens ? The random variables are on the signal nature, who assure you that what you are going to measure will respect the 87V's peak function rigid time constrains, beyond which your expensive toy will start to say you serious BS ?
The answer is : a DSO, this renders this kind of feature useful only to take voltage reading with short touch and go probe action.
Many lemmon PSUs out there source trains of very short pulses during power switch ON/OFF/ON cycles, well beyond 87V's peak detection capabilities.
And when it comes to PC power supply .... LOL ... try to put an high BW DC current clamp probe on 12V power rail and watch on scope screen how fast are load transients, also here 87V peak detector is still a useless and deceiving function.
No, it clearly shows the engineers didn't think the design through. Either that, or they just didn't gave a shit. Wait, maybe that's the reason they design a backlight that makes an annoying high pitched sound. How can you rely on a meter that does weird, unexpected things?
I wonder if you really wacthed those videos, the truth is there, no weird things with high res mode engaged, the BRYMEN has one digit more than 87V and it's working good for tendency monitoring, you have to accept it.
Double display? What for? It's not displaying anything useful, like voltage and current at the same time. PC connection - again, what for? Data logging? There are meters for that, like the Fluke 289. But they suck as general use meters.
No highed pitched sound in BM869S and talking about design flaws or crap component inside also Fluke has its OOOPS, like leaking supercap in 189 series.
About double display i think that Frequency plus Amplitude or DC plus AC are useful, of course current plus voltage would have been better.
And the price? Well, you gotta pay to play.
One can play for a lot less, even better, if capable enough.
"Clothes do not make the man", yes it applies very well here.
EDIT: Oh, and let's not forget the 4 times longer battery life of the 87V vs. the Brymen BM869s.
What really i cannot forget is the 2 times price factor, for the rest is matter of taste or personal needing.
I could afford easily the 87V, but why spend much more for less ?