One of the wonders of using a pressure-sensitive stylus is the joy of playing with lines of varying width. I never get enough of being able to start with really fine lines, then transitioning to bold juicy ones by applying just a touch more pressure. Working this way also requires a lot less effort than the traditional media equivalent, which means ergonomic advantages that I can certainly attest to. (And I never have to buy ink nor clean a pen ever again!)

Do note however, that to enjoy pressure sensitivity, your iPad has to be 3rd generation and newer, or released from 2012. You might be squinting or frowning right now trying to remember when you got that iPad that has been lying around. The chart on the left might help. Turn your iPad over and check its model number (those tiny numbers below the word 'iPad') against the chart to see which iPad model you own. If you see a tick, you're in!

BUT...you should also be aware that while your iPad can talk to newer pressure-sensitive styli, it might not run the latest apps very well. The difference in power and performance between the first iPad and the latest is HUGH; day and night difference, really. As developers take advantage of all the power available to them, older iPads may stutter and faint from the effort of trying to keep up. I'll venture to say your digital sketching experience could be frustrating on anything older than the first iPad Air.

I can't talk about styli for older iPads without a quick mention of the one I used, loved and took everywhere for 3 years; my (modified) 1st gen Wacom Intuos Creative Stylus which I used with an iPad Air. I've written extensively here about the hows and whys of adding a teflon tip to the rubber end, but cannot recommend this solution any longer as those teflon tips are no longer being sold. And no matter how cheap, do not buy the Wacom ICS2. It's a real lemon. (Impossible to draw decent diagonal lines or circles slowly.)