Well thanks to this thread I am now - after a year - 450 GB pounds out of pocket but richer in owning 22 old chess computers! I aimed at economically purchasing as wide a variety of computers as possible from different authors and playing strengths. Giving how much I spent I could have just bought a super-duper modern chess computer, but I love the variety.
I normally play on a real board and only press the computer squares with my fingers - in general the computer chess pieces are a bit cheap - and give myself infinite time. Works well, if I get bored of one I switch to another.
Barely. The Mephisto Mini is rated at around ELO 1200 (SSDF).