ETH is one and leading atlcoins which has so many use , but I use it to buy other alts just like btc and store also for long term investment which I believe is the best case for it use.
Same here, I used it also the Eth to buy the ICO's and some tokens. But right now i it looks kike I am at a losing end since Eth prices was low. I should save also Eth and hold at he moment as market is very volatile. Eth is very promising but its full of uncertainty right now. I hope it will recover soon.