Actually, my parents got them themselves.. I got one for my grandmother when her computer crashed (I was so happy, I ordered her a chromebook and had it overnighted). She was so happy with it... My mom got hers after she saw it, and knowing that it didn't have to deal with viruses, all they ever did was browse, email, facebook. My dad got his about six months later, and my other grandmother got hers about six months ago.
They've all been very happy with them... well, one of my grandmothers has trouble with using it sometimes, her hand shakes, but that's a problem with desktops for her too.
I used one for about a year and if I were able to use the VPN to remote into work (stupid proprietary VPN software), I'd probably still be using it... I used remote desktop and SSH to other systems when I needed more for work, but was pretty happy with it. Yes, there were times I needed more, I had a desktop for that... one at work, another at home... most of the time I used my chromebook though.
These days aside from at work, I use my htpc for more web stuff than anything else... I've tried a few android and arm based mini systems for that role, but the experience was less than stellar.. currently an i3-5010u which does pretty well for my general use, and htpc chores. I'm on it right now.
Most people only use/need the web for home use... Chromebooks are great for that... There's even a few halfway decent general purpose email clients being worked on (one client to work over imap, etc for multiple accounts) as opposed to typical webmail. That was about the only shortcoming I really felt. Also, getting my private rsa token for SSH setup on the thing was a little bit of a pain.