It should work but we've not tested it yet. We will certainly be supporting it and testing it fully for future users. Opera for EPOC is at least twice as fast as the existing browser, especially when it comes to graphics. With graphics we don't convert the JPGs and GIFs to the Psion source and we don't have to rely on the included libraries. Opera draws the graphics directly.
Opera is also faster at laying out text.
At the end of the day Opera is more efficient because it does not rely on the Psion libraries. Opera is in the game of rendering HTML pages so it just makes sense that it is what we do best. Over the next few months, the 3.62 Opera source will be upgraded to the 4.0 source and at that time we'll have all the features included in that version. Go faster and go smaller. In the next release we're looking at making it more coupled with EPOC and it will look like an EPOC application.