For me the decentralized nature of bitcoin and the thought of being able to send coins to anybody in any part of the word, no third party, no regulation(specific amount), no bullshit is mind blowing.
Bitcoins impresses me on its value that keeps on increasing even there are a lot of people who are creating black propaganda and governments that are banning bitcoins in their country in order for it not to circulate in their place. Even with this different negative scenario's bitcoins still manage to reach 16k dollars and more investors are keep on coming each day.