+1 on Cullen's comments. It'd be great to hear from someone who's used parse, kinvey, stackmob, etc. I've looked at them a few times but every time I end up with the same concern that I'm buying into a set of proprietary APIs that I know are going to be highly-restrictive and I'm going to have to create extra server-side code or a database anyway to get around limitations... then I've got a frankenstein mess that I have to integrate *and* pay double for *and* not take advantage of all the super-cool stuff that is coming out on mainstream stacks.
Like Brent, I've ended up on angular/node/mongodb (and obj-c).
Having said this, if you primarily have client-side functionality and you just need a place to store some extra data and handle push notifications, then parse et al makes a lot of sense if you don't have the server skills.