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I bought some alu brazing rod a while back when I was going to build an alloy camper trailer. Problem I had was unlike welding, there's no way to tell a good joint from a bad one. I don't remember how many test pieces I made, but only one survived destructive testing. I'd be wary of using this process for anything important.
I now have a FLIR camera so that would at least mean no more guessing how hot the work piece is. Alternatively some heat indicative paint could also be helpful, there's not much room between hot enough and burning a hole when working with ally.
All in all, I'd rather have a messy weld than a neat braze.
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