I must say that the functionality of the app really does a great job at behaving like a native app, but there was some lag when returning to the main screen via the "Cancel" button.
When HTML5 is ready for prime time, I want it to fly. I want the apps match the performance of native apps (stop fooling yourself, currently they are close but not perfect) or even outperform them.
I'm happy that you like our app, but I admit it isn't perfect. On the other hand, how many native apps are far from perfect? We have set our mission to create the tools needed to create amazing apps with web technologies and we hope to prove that it is possible. Again, I admit that the tools aren't widely available, yet. But the underlying technology is ready in my opinion.
Consider this: How hard would it be to ship iOS 7 UI with a native app now? Why did no native developer do that, yet? Isn't it kind of telling that we were able to do it, despite the fact that a lot of people still say that HTML5 is far inferior to native programming? I'm not saying I have the only truth, I just hoping that people reconsider their prejudices and give the web a chance.
Why would you want to ship iOS7 UI now specially on the devices that don't have iOS7 yet? It just wouldn't look good. Btw, I don't think that would be impossible to do, but it would be stupid.