Speedtest and Netflix test results
Here are the results.
After the first 6 GB, the Unlimited data at managed speeds seem to be fixed at around 300 ~ 400 Kbps.
If you are wondering what you could do with ~360 Kbps, well, you can still playback Youtube videos at 360p or 480p. Audio streaming apps have no issues running at all.
Of course, if you require faster speeds, you can always use the app and buy more 4G data.