I have a somewhat complicated and relatively pricey connection to the internet. Broadband and DSL combined using a HOTBRICK Dual WAN Firewall Router. We haven’t been tweaking it that much because it was such a steep learning curve to get it operational.
My impression is that you can’t expect to get very good support from your ISP(s) for this kind of thing, because they don’t know how their competition works in detail. One guy basically told my wife that it was just NOT possible to set up a combined redundant service. That was all the motivation she needed to get it to work.
With all this going on, I expected Joost to work like a charm. I have had a few brief shining moments of good functionality, but by and large my Joosting has been a wash. I cannot be sure that it is my internet speed that is limiting my enjoyment, but I suspect that it is.