This article was trying to explain how to test it without making any lasting changes to your system--trying to remove any objections from that direction.
I would recommend anyone SSD to run your system. It is a flash -memory type drives with no moving parts typical to USB sticks and much faster than HDD on average.
I think installing OS on one of these is the most cost effective way to make your computer faster to date.
They are quite expensive for units larger than 256 GB to fully replace HDD technology by now, but sufficient to run system and demanding application already.