I am sure this has been said before, but a "scope" with 100MHz real time sampling is pretty much a toy. If you want to see anything else but a sine wave, you will be glad to get an usable bandwidth above 10MHz. 50MHz with 2 samples per period is not very useful apart from seeing whether or not there is some sort of signal present.
The deal with equivalent sampling I wouldn't even dare to mention - sure, you can "cheat" like that, but in this context it just makes a poor product look even worse than it is, because it makes an impression that you are trying to artificially prop up the poor specs in your marketing materials with something that only confuses the unwary and is useless in practice on this type of scope.
BTW, that Picoscope you are citing has a 1GHz realtime sampling rate and is a very different category product.