I got huge amount of mileage out of Psion Revo. It was more limited than 5mx, but exactly the right form factor to write anywhere. And well, having usable sprea

I got huge amount of mileage out of Psion Revo. It was more limited than 5mx, but exactly the right form factor to write anywhere. And well, having usable spreadsheet, OPL and EMX Unix-like environment was also a large plus. And well, I got it almost new-in-a-box in 2005 for something like 50EUR. Sadly the battery died and I managed to break the hinge while replacing the battery.