Uni-T is like hundreds of other Asian measurement instrument manufacturers, mediocre quality and no support.
What distinguishes them, and a few others like Rigol, from the mass of Asian instrument manufacturers is they go the extra mile to produce an English manual of dubious quality. This is relatively rare. Even rarer are Asian manufacturers producing good English manuals. But because of the combination of cheap and English manual Uni-T is one of the few manufacturers people like to import.
It is not the quality that makes people buy them. Look at that UTD2102CEL mechanical construction. You immediately notice two goofs. Power supply socket sticking out of the left, making it difficult to place it in a rack or shelf with other instruments. The plug belongs at the back. And the power button is on the top. WTF? The button belongs on the front panel.
Then you notice there is only a front USB plug. The manual says it is OTG, so might work for a PC connection, too. If it does work for a PC connection, you have that USB cable hanging around on the front, not on the back.
The manual is not really clear if it can interface with a PC at all. If it can then the control commands for the PC interface aren't documented, and I bet my pants their PC software is shit.
Next thing is they don't make full use of the wide screen. The menu on the right seems to stick and take up a good bunch of the screen.
But even with the menu occupying the screen, the claimed 800 pixel horizontal resolution doesn't add up. They have 12 horizontal divs. So they must cram like 50 or 60 samples in a horizontal div to make use of that resolution. And it would be hard to discern individual samples at that 50 samples/div resolution. Or they just cram the usual 10 samples in, and draw lines between them (shudder). In the manual they say they start interpolating 2:1 at some point (shudder). That would mean they still cram 25 or 30 real samples in a div, still hard to discern individual samples.
Also obvious, they still haven't sorted out their memory length vs. memory depth specification confusion. Only that they now introduce the terms recording length and saving depth, too. So is it 2 * 600k (recording length), or 25k (1 channel) / 12.5k (two channels) (saving depth)?
The advertising says it has a special print screen feature. Again over that single USB plug? Memory stick, PC, printer all over one USB plug? BTW, I can't find mentioning of that print feature in the manual. Again, they don't manage to come up with a clear specification.
That UTD2102CEL is just the typical Asian lucky bag. It is left to the buyer to figure out what he got. Uni-T won't care once they have your money.