Yes, I was unlucky to buy this piece of ... something.
From the point of view of observing electronic signals 6254EU is more or less on par with other similar devices. Of course, it's internal 8-bit ADC means noisy acquisition of waveforms. This is unpleasant but typical for low end oscilloscopes. And of course, 250 MHZ bandwidth is a lie. Or maybe, from legal point of view, not a lie, but incomplete information.
Here comes unexpected.
1) HUNTEK software is so buggy that using it is a challenge.
When adjusting voltage scale factor for a channel you never know: what have you got? The screen shows 200mV per div, while in reality it looks more like 2V/div. And after some switching between setting controls, all of a sudden, you find that trigger level has changed itself to zero. Now you have to readjust it again ...
None of File/Save data saving methods is really functional. Saved data contains only a single channel, despite specifying "All". HANTEK EXCEL format is not recognized by Microsoft EXCEL.
"Save image" saves some truncated picture. It is abnormally large even in JPG mode.
Bug list accumulated during first hour of attempted work with 6254EU is endless. And I do not think it is likely to be ever fixed by the manufacturer, because the software stays unchanged since 2020.
Needless to say, HANTEK SDK is documented in Chinese only. So, there is no chance to design my own version of GUI software.
About other documentation. The language looks like English. But very-very unclear and confusing.
2) And on top of that - the device has cooling fan producing unbearably loud high pitch noise. Hard to stay nearby for more than half an hour.
How can I get my money back? That is the main problem I am trying to solve now ...