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The "DOS1102" part is the "standard" model name and there are multiple makers of that model. Standard chinese practice is there is a "design" and is branded by a bunch of trading companies. All are probably identical, though there are often lower priced versions that don't meet some spec. I found one on amazon for $170.

While non-recognisable brands might be a diamond in the rough, there is no way to tell. If you buy a name branded model, then you have a chance they have a reputation to look at.

If you are looking at waveforms and that is about it, you probably will find such a scope useful and satisfactory.

When I was in the market for a scope, I went with 4 channels and I am glad I did. I don't always need more than 2 channels, but when I do...