Sankey kegs can be a little bit tricky to use because it is difficult to pull the spear out. It is essentially a closed system all the time and so you need to be able to clean and fill with it sealed up. That being said, if you can fill and clean easily, they are a much better system than corny kegs. There are so many ways a corny keg can fail - the connects, poppets, lid, pressure relief - can all leak gas (or beer). Sankey kegs only have one connection.