These make a huge difference to the quality of your footage. A full stabilisation vest with a heavy camera kit looks great but there are plenty of other options these days. The Ronin-S is incredibly popular and makes it possible to produce incredibly smooth moving footage from small cameras like the Sony A7S mkII or the Canon 5d MKIV. The Ronin-M can handle cameras like a Canon 1DX MKII or a stripped down Sony FS5. But be careful not to use a heavy lens.