You know, that one's been on my to read/listen list for literally YEARS, but I tend to just grab the first thing that comes to hand when I finish the last thing so I haven't gotten around to it yet. That you liked it might make me seek it out specially next time though.
As for the original story Vs sequel question... I suppose with a sequel, you already have a lot of the promotional stuff sorted out because people have read the first story. Also, I think the authors often like to explore what happens next, which is bound to produce sequels.
BTW, where is the best place to get How To Disappear Completely? If there's somewhere I can just pull down the whole podcast in a Zip file, that beats faffing about with a Podiobooks title page, for example.
Not that I don't adore Podiobooks, mind you