As you know Epsilon, I personally asked the then CEO Jannie van Zyl about the shaping, because I figured that if they at least relaxed that, it might be a worthwhile proposition for certain applications. His response was "I'll look into it" and nothing has changed!
I also found out recently iBurst has failed in Australia and has since been discontinued there. I haven't looked but I suspect that one will soon see cheap modems being flogged on eBay, but knowing iBurps they'll blacklist all those serial numbers.
Latency was a big issue for me with iBurst.. I can't tell you how that drove me round the bend, especially when one is trying to post on a forum such as this. Not only that, their DNS is forever falling over, leading to legitimate sites being blocked or appearing as "down"
It amazes me they can shape the thing solidly, so much so that one needs a VPN to bypass it, yet they cannot even get the billing right after 5 years in the game.