Data saving: Opera max, Neopard, Onavo extend

I am trying to test all these apps and see how easy and how save they are...

1. Opera Max
2. Onavo Extend
3. Neopard


 1. Opera Max
pro:
- easy interface
- block app option

 con:
- work at the background after disconnection (eating up battery?) -> solution: stop it in app manager and greenify it (abruptly!)

 2. Onavo Extend
pro:
- easy to use as 1

 con:
- 2 background process after disconnection
- block contents of my comic app (not able to load/ display)

 3. Neopard
pro:
 - takes time to load
- auto switch off when switching off the app that using network
- showing clearly how much data save, significantly..(?)

 con:
 - slow or blocking loading of my comic app
- Final verdict: use Opera Max as it can load my comic app (one of the main use of my phone)

 welcome for any sharing

 ps. someone has done similar review already:
https://aprotip.wordpress.com/2015/07/21/how-to-get-double-of-your-mobile-data-plan-extend-data-plan-using-data-saving-cloud-compression-technology/