I have experience using the ComponentOne iPhone Library and it met my needs perfectly.
Although I encountered several bugs a few months ago while working with it, especially when dealing with dynamic data generation and AJAX updates, the components functioned well for standard purposes similar to those showcased on their website.
To be fair, considering that the tool is relatively new and my experience was a few months back, it is possible that they have addressed and resolved those bugs since then. Moreover, I was able to work around them after making some adjustments.
If you'd like to explore the library further, you can check out the Live Demo from your iPhone.