I started watching 009-1 back when it began airing in 2006. Sadly, it took more than a year for its subbing to be completed, and by then I had forgotten all about it. It was only a few months ago where I was able to obtain the complete series.
The first few episodes of the series are pretty slow. Like Golgo 13 and manga that haven’t aged as well as its creators would like, the episodes are standalone and deal with 009-1’s individual missions. Its first five episodes are quite forgettable, actually.