HN user
I very much like OnLine Taxes; have been a customer of theirs for four years now. My experiences with their customer service have been great (this matters most to me), and they're very cost efficient. You must be willing to put up with a somewhat antiquated UI (think circa-2007 PHP app).
This makes me so excited to be a budding Perl dev.
Developers that view "Practical API Development" as something more important than agreed-upon standards is also the reason Microsoft Internet Explorer has a long history of suck.
"But honestly, why would your users be creating an object with an id?" They aren't. You should not be PUTting endpoints with an id. I get more more and more scared as I type, thinking about this change-the-standard-for-my-own-purpose attitude.
Generalizations are bad. At work, although our front end uses our REST API, it is also used by many different backends of clients that integrate with our service.