At one point I owned two Portfolios, which I used for note-taking for several years. I like the built-in software, and the fact that they managed to fit removable storage and an expansion interface into such a small system. The biggest limitations are the keyboard size (inevitable given the form factor), the old memory card format, and the fact that there is no built-in I/O (yes, you can add serial and parallel modules, but these make the system much too large and unwieldy for a palmtop). The screen was also problematic: the hinges would get very stiff and squeaky over time, and one of my screens failed because of a bad ribbon cable. The rubberized coating they used on the exterior of the case also did not hold up very well; even inside a carrying case, it collected scratches and scuffmarks very easily.
I held on to them for as long as I could, but I eventually upgraded to the
Tandy 102 for writing, and I still use it today. It has many of the advantages of the Portfolio: it provides very long battery life on ordinary AA batteries and it has a good collection of built-in software, but the keyboard is much larger, it has a built-in serial port, and thanks to aftermarket upgrades like the
REX, the internal ROM software and the storage capacity can be expanded with ease.