I'd say most netbooks or tablets replaced it for all of those things now... But you're right that Psion were super innovative. More important than their series

I'd say most netbooks or tablets replaced it for all of those things now... But you're right that Psion were super innovative. More important than their series 5 hardware was the operating system. EPOC was a 32bit embedded OS long before anyone else was doing them. It was nice to program for and dealt with multiprogram which even the first iPhones didn't think about.