Once I had a requirement and ended up trying nearly all of them and unfortunately, had to write my own (took about a day and a half) that accomplished the tour exactly the way I wanted. Off the top of my head, I can't recall what each of them missed but primary reason was that often they take off with a great experience and then the lead developer can't devote enough time to meet the diverse requirements of a huge community. The library ends up with a huge user base with lots of open issues, some critical to the user experience on the myriad of mobile devices.