We are using Collector and happy with a lot of the functionality and the ability to included attachments. We find it slightly limiting, though, that more device information cannot be automatically included. It would be really helpful if you could automatically include compass information (heading, bearing) and orientation information (pitch, yaw) and elevation. An option to automatically add it when you take a picture or capture that information with a button press.
This would be very helpful for creating some detailed symbology where each symbolized point has a picture, or even mutiple pictures facing the same direction.