I\'m running Opera on my 5500 (with tkcROM v1), and generally I like it. It\'s reasonably fast, and the multiple windows feature is handy.
The download feature is less impressive for me personally, as you don\'t seem to get much choice over where exactly you want to save files. I normally choose \"Copy link location\" from the tap-and-hold menu, open the terminal, change to the desired directory and enter \"wget [URL]\". Long-winded, perhaps, but it works better for me, and you get more information as the file is downloading.
I also really don\'t like the lack of support in this particular Opera for \'media=\"handheld\"\' when it comes to stylesheets, as this means I can\'t get the stylesheet optimised for PDAs, when I visit sites which specify them (ironically, including Opera\'s own site).
Other than that, though, Opera does the job for me, and I\'ll probably stick with it as long as there\'s not a more capable option.
Tim