Opinion: being someone who has never voted on such a device, I cannot say for myself whether the process of voting is easier on an electronic machine. But I liken it a little to things like the Climate Survey at Fenn versus something similar on paper, and I do think the computerized version is easier to work with.
One con of course is that such a machine might be hacked or in some way infringed which could completely kill any chance of using them again if it was discovered. I'm sure the legit machines are very well protected though.
Lastly, it has to be mentioned that the paper voting does kill trees. Even though this doesn't make it easier or harder to vote it should be considered.
The facts: In the coming elections 70% of voters will be using paper, after a national trial resulted in only six states being "very satisfied" with the electronic machines (two of them in New England). And while 24 states were "generally satisfied" with the machines, nearly half still chose to make the switch to paper when the federal government gave them the choice. The reason this is true is because the past two years elections have been disastrous in certain instances. In a 2004 election in North Carolina, more than 4,400 votes were lost after memory cards filled up. When the election for the state's agricultural commissioner ended with a 2,300 margin, controversy sparked.
Also, three different instances from three different sites were reported where votes for presidential candidate Mitt Romney were recorded instead as votes for Barack Obama.
18 states are using an all-paper approach with a writing utensil. 10 will give voters the choice between paper and electronic, where a voter using the electronic machine will receive a verification slip, and 6 will do the same without the slips.
Sources: http://www.theblaze.com/stories/2012/11/01/why-are-some-states-dumping-their-electronic-voting-machines-and-going-back-to-paper/; https://www.verifiedvoting.org; http://votingmachines.procon.org
Feel free to leave your opinion in the comments! I am not really sure where I lie.