The concept sounded really cool, but then when it came down to actually using in production I had a hard time arguing with myself: "Eh, why not spend a night or two just building out this integration ourselves the exact way we want instead of wasting that much money on something that doesn't even completely fit the bill."
The subscription SaaS cost quickly supersedes the developer cost in a matter of a few months, although I suppose it could have some niche uses with a proof of concept/MVP.