We bought one three years ago for my parents -- of course, "non-computer users." They LOVE it. We only gave the address out to a few family members. My parents really enjoy when we e-mail a photo of our kids from something that happened that same day (Halloween costumes, Christmas stuff, school programs, athletic events, etc.). They feel like the rest of us with the current technology and instant communication. Since we live 700 miles apart, it really keeps them in touch with us (mostly the grandkids).
All they have to do is change the paper and the ink. It's about $12 per month for the Presto subscription. You can be the account administrator online for them. All you have to do is enter the addresses that are allowed to e-mail the Presto machine and set-up the time(s) of day you want Presto to check for messages. It's very easy!