The free plan is good because you don't have access yet but if I need more space, there are plans for it so that's ok too! Nothing really other than maybe having an option of how many users can use at one time or something like this? Maybe give them some upgrades before everyone wants their service as well!! Good way get people aware about what they offer while still making money in order not just be giving away services out no charge. Not much since we've only used mail slurping once (to check our sign up processes). It was useful when checking things off my list though haha.