Exit tickets are excellent. I have used them for years and loved being able to provide a way for students to reflect on the lesson. Another positive for exit tickets was the information I was able to quickly gain so I could better prepared for the next lesson. 

However, paper exit tickets can be time consuming to sort through when you have multiple classes, and the time spent reading (and deciphering) the writing can be overwhelming.  Technology has helped with my organizing of these tickets by providing a digital copy I could access anytime, but there were still problems. 

Students were slow typers

Some still struggled with spelling and getting thoughts out 

Just because a student struggles with writing, doesn't mean they don't have ideas worthy of sharing. The built in microphone on a Chromebook can be leveraged to provide voice for students to get their thoughts out and make exit tickets easier than ever to use.