I used the word errors for lack of a better one, hence the 'errors'.
The Angel led was a pretty good design, but a few things could be improved, as it turned out. They made a new 14 way (and another one for the IR3), and the lcd has a longer bolt, which they claim makes for a more stable firing cycle. I'm sure there were another few small tweaks, but that's all I can remember from the top of my head.