I have to say, I'm quite happy with that purchase. Since I bought my benchtop scope, etc, more than a year ago, I have done almost nothing with it. Mostly for a lack of spare time, but also:
a) Complication factor: Benchtop oscilloscope has many controls and a thick manual. This toy is absolutely basic in comparation, so one has to work with the essential settings. It has allowed me begin to understand the most basics aspects of operation faster than the benchtop device.
b) Fear factor: Not afraid to screw this thing, it's dirty cheap.
c) Comparation factor: When I saw that outputting a 5Vpp square vawe this toyscope was giving reads higher than 6 Vpp, I asked myself why. When the benchtop scope did the same, I knew it was me screwing up it all. Then a search in the forum of course gave me the answer.
BTW, I think you all will find quite interesting some advice that appears in tis oscilloscope manual. Looks a little bit kamikaze to me. Please see attachment.
All in all, happy with it. Sad I don't have spare time right now, I was getting quite fun. Will have to wait perhaps two or three months...