1Msa/s is enough for 200kHz bandwidth if the analog input is bandwidth limited and the digital output is being processed properly for display. Probably not. Worst thing about these is not the BW or sample rate but the slow display update, response, the controls and UI in general. They are not at all practical. But if you don't expect too much from it, you could have a bit of fun with it. Treat it as a ~100kHz BW toy scope. For <$30, it's a pretty cool toy.