I've used coinbase extensively over the last 3 years and am mostly a fan. But…they just can't compete with Gemini on fees. Gemini gives instant credit for ACH deposits up to $500, accepts wire transfers within a few hours seamlessly and charges just 0.15{88c91daedd271a990a10650c05d769cae2765e0603edf30ca95f18704e5748e8} fees on purchases. Gemini has much less back and forth liquidity than GDAX, but the order book is plenty deep to trade in size.