For example, we had over 90% voting in our independence referendum. In a local government election, the turnout might well be closer to 50%. It's much more a function of how voters view the specific importance of the election rather than what the system is, though. Voters will vote more if they think their vote will count more. That's been our experience. You can usually tell in advance whether the turnout is going to be very high or not so high, and it has nothing to do with what the system is.
One of the other things I would say, though, is that another indicator of whether voters find it difficult is the level of rejected papers and the level of papers that are not accepted into the count. Those that are specifically rejected because a voter hasn't managed to cast a vote clearly are very low in Scotland. In the referendum we had two years ago, fewer than 0.01% of papers were rejected. People obviously found it relatively straightforward.