Is Google Cloud Messaging Gcm Reliable?

I am developing an application that will get some data from the server e.g. live feeds. It will be a multicast message. I just want to know if whether GCM is reliable. I don't want

Solution 1:

Neither GCM none other similar services like iOS Push notifications are 100% reliable, but those messages are usually really fast and they always work, so it depends on the level of trust you need. I'd personally go for them.

Solution 2:

I have used GCM before, and in my experience it is very reliable. If at all i faced any issues, they were in upstream messages (i.e from the device to the server). I would say that you will get much better performance than 70% delivery with a one hour delay. Go for it! :-)