Can't help but agree with everyone here. My contract expires next year, and I won't renew. I've been with iBurst of almost 4 years now. While the first year with iBurst was great, things gradually got worse thereafter.
First, my speeds plummeted towards the end of the first year. I thought that it was a simple signal problem, so I bought and installed an omni antenna, and that seemed to solve the problem. Everything was fine after that, but towards the end of last year, speeds and signal dropped again. After much fighting, I got iBurst to send an expert out. He told me that the nearest base station was too congested, and that I needed a flat panel antenna that can point to another less congested base station. That was done, and my speeds and signal quality improved significantly, if only for a few months. Even though the signal quality is great, and the speeds are supposedly good, I still suffer when trying to watch YouTube videos, or when trying to download games through Steam. I don't think it's the base station so much as it is actually iBurst who's at fault.
Truth be told, I'm not even using iBurst anymore. I have over 76GB that's been accumulating over the last 3 months or so. After all, how am I expected to use that much data when iBurst is shaping my connection to such an extent? Of course, I still have to pay even though I'm getting a sub-par service. I'm currently using ADSL and I couldn't be happier. The difference really is day and night.