What is great about this coin? What will it be used for?
BlackCoin is the first 100% proof of stake, free cryptocurrency with fair distribution (no entity privileged: no premine, no ICO).
Just adding to that. PoS has a few advantages over PoW.
User don't have to pay for the cost of mining to giant mining farms through inflation and fees. The network can be secured by staking on raspberry pi's for negligible cost. It's very efficient.
You also receive income through staking at a greater rate than inflation with PoS 2.0+. The rate is approximately 5% at the moment, with approximately 1% inflation per year currently. For example, if you were to buy 1% of the network and stake you would have around 1.04% of the network after a year.
Myself, I plan on price averaging and staking for at least several years, on this coin and maybe others if I ever find another decent PoS coin. To profit all I'll need is for the coin to perform better than -4% loss in value per year on average, though ultimately I'd like to simply save enough to live on staking income. The price increasing would be nice for me, but it's not necessary for my goals personally.