The thing is basically a tiny Linux machine running a webserver and ssh. You can mess with it all you like (with the usual caveats about knowing what you're doing and risking bricking it).

I've ssh'd into mine and it looks just like you'd expect. I didn't mess with anything (because I know that I don't know what I'm doing with it).

I've also used the "email me a PDF of this page" function a couple of times and it works perfectly.

I bought mine before the subscription kicked in, and got grandfathered in, so I can't comment on that.