Actually, it's annoying because as you start reading the first lines, the content keeps scrolling (often with jagged movements). I always have to scroll up immediately after the stream begins to disable this behavior.
That looks really nice. I do wish you would consider one-time pricing for those bringing their own API key on the “Dev” plan, though :) I’d pay ~$20-30 for a nice desktop app like this but won’t enter into another $48/year sub.