Wow, I just started playing with Sencha Touch version 2 which you can now download, and which comes with an extjs 4 style API on the sencha website, and I was so impressed I spent a few hours this weekend ditching my entire ICD10 app that was being written in jquery mobile. Why? The one word answer is speed, both in development time, and performance. Unlike version 1 I could hardly tell if I was coding extjs or touch, they seemed to work and act the same, this is a great plus for someone with a 9 – 5 in extjs coding. As far as performance is concerned take a look at the two apps side by side, then try to do a search for a medical term like ‘strep’ and see how they both respond. Now, imagine this difference playing out on a mobile device and not your desktop.