I have good experiences with Ionic Push, worked great for me after some initial hurdles.
The issues I had were related to the Ionic Web Client app interfering with Firebase and some issues with the GCM setup, but I was able to work around/fix these.
For the rest, Ionic Push worked great for me, it was fast and reliable, it was easy to set up and get working, I didn't feel the need to look at 3rd party/other solutions.