Back in the 90s I had switched to a PC (Pentium 120MHz 8MB RAM) running Windows - not a good experience after using the Amiga. It was slow as molasses, multitasking was abysmal and it crashed a lot.
Then, pretty much out of the blue someone sent me a copy of BeOS.
It was amazing - it was fast, it multitasked (properly) and didn't crash all the time. None of these were true for Windows. After using Windows it felt just like being on an Amiga again.
--
The Psion 5mx also reminded me of the Amiga for some reason. It was a real computer rather than some toy.