I did have trouble selling when I wanted to take profit when btc hit 19k. Now I see ltc buy and sell is suspended on coinbase. Other than that coinbase has been reliable and I've done well. I don't know if I'd call coinbase a scam, the overload on the servers during high volume is a pain but can we chalk this up to growing pains. Bitcoin is all over the news lately and everyone thinks they will get rich so coinbase is getting flooded.