You'll learn to be a better reefer without one, but you'll also quickly be looking for ways to automate certain processes. I have inconsistent hours at work and frankly some days I just don't want to deal with the aquarium, so I need help feeding at consistent times. I could just get an autofeeder but there are so many other benefits to the Apex besides autofeeding that can possibly save your investment, such as leak monitoring, temperature alerts, etc.
Personally I didn't consider getting a controller until I started dropping some serious coin on this aquarium. Now I think of a controller as insurance. The stability of consistent feeding is just a bonus. I'm saving up for the full Apex, I am definitely a believer in "buy right or buy twice".