I updated my N80 to IE through NSU yesterday.
Now Antivirus icon is missing, phone seems to be a bit slower than before, but may be it's me. there is also internet phone app now. Overall, i don't like it. Someone wrote that with IE fw phone Wifi scans better, and you can see more hotspots, i didn't notice any difference at all.
For some reason currency convertor doesn't have rates installed anymore, you have to put them one by one by yourself, but so was a case with my previous.42 fw, but on my earlier 3.0617.0.6 all rates were available, which was more convinient.
BTW, downloaded file was about 74 mb big.