I'd really like to have a sampling scope that small with a 2 to 5Mhz band width. Most cases that I need it that fast would be to sample repetitive signal, like clocks or dividers. I'm wondering it one might intentionally use aliasing to get sampling of such higher frequencies of repetitive signals. One could post process the signal to be time reversed. You'd need to sample at a low enough frequency to be lower than the lowest component of the signal, otherwise you'd not be able to determine if it was over or under sampled. Aperture window has to be smaller than the highest frequency.