We're going to be turning on ReST Web Services in our NetSuite account soon. What things have any of you experienced after enabling ReST Web Services that made you think, "I wish I'd known that BEFORE we turned it on." ?

Depending on your suitecloud+ licenses, you only get so many (i think its 10 initially) connections that are shared across the account. So its possible you have so many that some could requests could get refused. Otherwise, 99.99% of accounts i've been in have this turned on and use them for some type of integration (custom/celigo/etc...)