I wasn't surprised when ETH hit this 600 level, but it has been surprising that ETH has gone this high this fast. ETH/BTC is hitting a major resistance line and ETHUSD is hitting MAJOR MAJOR resistance at this 675-700. If the market pushes all the way up there and starts throwing signs of topping you could short ETH at those levels. Go back in the charts and look at how significant a role this 675-700 area has played. Support becomes resistance once broken. If we bust through it it will be very surprising.