The bundling worked really well. It was time based as well, so you'd end up with this weeks "Updates" bundle and last weeks, which meant I could then scan last weeks to make sure I had everything then delete the whole bundle.

Somehow the way it dealt with notification emails was also really good. I was able to keep on top of github notifications and the became useful rather than noise. A combination of the bundling + displaying the most pertinent link and info instead of the subject line.