what impresses me the most about bitcoin is its ability to make transaction much easier, faster and much secure, also I am very impressed by how much it grows on such a short period of time, that is also the reason why I start on doing bitcoin.
For me the the whole cryptocurrency system is impressive. The price of bitcoin is high and still fluctuating to a higher price. Another impressive thing about this is that you only need to invest time to earn it. You can not be scammed in bitcoin if you are following the instructions and making sure that before you commit into one event or campaign.