I use all kinds of storage. Paper wallets, nodes, bitcoin.de, bittrex, poloniex, coinbase, kraken, etc.. I have never sold any crypto, only mine. I have always stumbled accross Changelly, but everytime I wanted to execute a transaction I got so pissed off, the BTC price etc. is so far off and unjustified that I started to coagulate. I mine Dash, XMR, ETH, SC, UBQ, BCN, ZEC. I don't trust anything I can't touch. Too many bad experiences good buddy.