I read just the first paragraph of this piece (which is all that appears in registeruk) and thought "This must have been written by lproven". But no, it's by someone else.
PsiXpda Pocket Computer About 10 years ago, Psion's handheld computers were the ones to beat and the Psion Series 5 was at the top of the heap. The keyboard was tiny but so well designed that it was really possible to touchtype on it. Indeed, the Series 5 set the standard for others to emulate, and, quite simply, as far as usability is concerned no other small format device since has come close.