I have an SDS7102, the 100MHz version of this, which I've owned for about a year.
I absolutely agree that yes, it does have some really stupid bugs and the UI isn't great, however it's not complete junk for certain applications.
Some features are unusable or less than useful; the copy button doesn't work very well, usually defaulting to wave rather than image mode, and the PC software is frankly useless. The persistence is not robustly written and the cursors are not very well implemented (based in the frame buffer, as far as I can tell, so they don't stick to the wave if you pan or change the timebase), but for what it is, I believe the 100MHz version represents reasonably good value for money.
When I bought it, I required a cheap scope with good memory depth and a decent screen, and at the time the memory depth on the Owon blew everything in the low end scope market, including the Agilent 2/3000x series, out of the water. (I never understood Agilent fitting the otherwise excellent 3000x with only 2 or 4 MB).
The other Chinese scopes are at best a couple of meg, often shared between channels, whereas the Owon has 10MB per channel.
This has of course been significantly beaten by the new Rigol 2000 series now, but that option didn't exist at the time..
The battery is also a very useful addition (it lasts about 3-4 hours)
Successive firmware updates have improved some of the glitchiness, albeit nothing like all of it.
If you go into buying or using one of these expecting an Agilent or higher end Rigol, you will without doubt be disappointed. If you go into it expecting a compromise to get good memory depth and a decent screen at a very low price, you will likely be reasonably satisfied.
I deal with a lot of one-shot events containing a lot of detail, which many higher end scopes struggle with due to their limited memory.
Try tracing a short cap discharge followed by a several-second recharge cycle on a scope with limited memory, and you'll soon be tearing your hair out when you want to zoom in on the detail of the short discharge event.
If I was buying again, I'd probably spend the extra money and get the Rigol 2000 series; but (and I'll no doubt get some odd looks for this) I don't regret buying the Owon.