I'm curious, what more did you expect? Exactly what wheels are being reinvented here?

Their API is pretty brain dead simple (it is just a matter of passing urls and data around) and the documentation is pretty good once you understand the general concepts.

I've given them a bit of feedback on things in the docs that needed improvement, and they've turned around with fixes within minutes sometimes.

I think that if you give them feedback on their apis mailing list about what you'd like to see added or changed, they'd be more than happy to listen. That is what really encourages me about this company.