I'm using wit.ai as well, and overall it's working well for me.
But, the new story-based functionality is something I still haven't been able to get comfortable with -- and it still feels very early. So, that part I'm still implementing myself.
And yes, I too wish they they would allow you to download your logs/model. Bugs me that they don't do that (and one of the reasons I'm also looking at api.ai).
Yeah I took a look at api.ai but the reason I ultimately went down the wit.ai path is because of Facebook backing them. Seems like a nice wallet + data set to help.
But, the new story-based functionality is something I still haven't been able to get comfortable with -- and it still feels very early. So, that part I'm still implementing myself.
And yes, I too wish they they would allow you to download your logs/model. Bugs me that they don't do that (and one of the reasons I'm also looking at api.ai).