The new pricing is very good, and you shouldn't need to pay until you're running a lot of traffic.

I find the iOS SDK to be pretty solid. Push notifications also work really well.

I have also noticed requests fail from time to time , but it hasn't been too much of an issue.

What I don't like is the query system. What would be trivial in SQL is sometimes difficult or impossible.

I also just don't like that cloud code queries are all asynchronous. Promises help, but complex operations end up as a huge nest of promises. I just have no need for server-side code to be asynchronous.

The console has been slightly improved, but the data browser is still a bit painful. They like to break the back button quite a bit too.

I have one large app using Parse as a back-end, but otherwise I just use it for push.