Compared to a sign like this it's much easier to read: http://resources2.news.com.au/images/2014/01/23/1226809/0832...
The big downside is when you park you don't just need to know the conditions when you park, you need to know the conditions for the entire length of your intended stay. You also need confidence that the signs will remain unchanging throughout your stay because if the signs update and you get a ticket the burden of proof is going to fall on you to prove your innocence.