I have done a couple of tests with this bandwidth control enabled and disabled. Cell C E1820 and MR3420.
On the average I get better upload speeds with it enabled. During the speedtest, sometimes the download speed would spike up to 5 mbit/sec, but "stabilises" around the 2 mbit/sec mark. The spikes do not occur with bandwidth control disabled.
Tests were done yesterday and today, at 3 different times in total. All tests to the Midrand speedtest.net server.