What a disappointment
I never had a Series 5, but I did have both a Series 3 and 3a and both were positively svelte compared to this.
Dare I say it? Psion at their best were like a UK Apple when it came to industrial design.
This is pig-ugly and running an OS that really isn't tailored for the form-factor.
Contrast to the Series 3/3a OS (only because I know less about the Series 5): proper multitasking, extremely capable PIM/word processor/spreadsheet/database/programming environment, and all running in 256k of RAM. And about 3 months on 2xAAs. OK so it lacked a touch screen and any kind of multimedia which would be essential now, but in a decade of use I think I only had to reset the thing about 3 times. Now that's stable!
Something this clunky, with a desktop OS that only lasts a couple of hours on a full charge, really doesn't cut it in a world where you can get a netbook for less if you want to type a lot, or you can get an iPhone or Android phone for less: both much more pocketable and entirely capable of doing most of what you want to do on the move apart from write a thesis.
The previous poster who suggested that someone should licence the Series 5 case design and put modern hardware and software into it was spot on.