I don't know why but I was expecting something more like vintage space opera from the 30's and was surprised to find this was actually written in the mid '60s and still feels fresh.
This is light, fast-moving, edge of your seat stuff that you will whip through in no time. A charming, loveable rogue protagonist is nearly impossible not to engage with. While he think's he's clever, he still gets outsmarted on quite a regular basis, his fallibility only making him more likable. There is very little world building and scene setting either to drag down on the pace of the story allowing the reader to focus on the characters and the fast-moving story.
I'm not sure how much of this long series I'm going to read but I wouldn't be surprised if I end up reading quite a few of them. Perfect for when you just want something light and fun but not lacking a certain wit.