I have not found either browser on the iLiad to be usable even for casual browsing.
The device is limited, but the primary problem seems to be lack of resources at iRex. For example Nokia Internet Tablets support Opera and MicroB (based on the Mozilla's Gecko 1.9 web engine), and these are both very capable browsers. Perhaps the Nokia's are more powerful than the iLiad, but the Amazon Kindle is more comparable and it supports the
NetFront™ Browser. I find this (as implemented on the Kindle) to be limited but much more usable than the browsers on the iLiad. Like Opera, iRex would have to pay for Netfront.