I'm a pretty heavy data user, and I've tried Max and a few others (like Onvao Extend. They may save some data for certain types of internet usage, but neither service was able to save more than 10MB for me over the course of a month.
That's probably not really their fault though - as VPNs, they're unable to process already-encrypted HTTPS traffic, and that's easily the majority of my data usage (Google+, Google Play Store, Google Play Music, and GMail are all encrypted to begin with).
I eventually decided that the inconvenience of having to re-enable the VPN each time my phone rebooted wasn't worth the ever-so-slight savings that I received. Your usage may be completely different, though, so feel free to try them out and report back.
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