Glad to hear rabl is working well in conjunction with rails-api. Haven't had a chance to try that combination yet, mostly been using rabl alongside Sinatra, Grape and Padrino.
As I said below, if it doesn't, please let us know: I'd consider that a bug.
We actually think that AMS is significantly better, but I'm glad rabl works well for you. :)
Mostly for the gluing and custom node editing, but also I really like keeping my rabl files (presentation) outside of my models
Totally. And there's a reason AMS isn't part of rails-api proper: we want you to pick the tools you want to use. If rails-api (the gem) doesn't work with RABL in some way, please let me know, that's a bug.
You haven't seen the full power of AMS yet, but I have some exciting things planned. :)