So far I've been having a blast with UIFlow on the Paper.
I have encountered an error, though, when using "Http Request"
When the code is Run through the IDE it works fine but when the code is "downloaded" to the device and an HTTP request is executed it errors with exception OSError 118 which I guess means the wifi is having issues in the application mode but not Run mode.
I was able to code around this by adding an additional "wifiCfg.doConnect('AP', 'AP_Password')" before the code is executed.
Other than that it's fantastic using UIFlow for development!