I just segued into saying that I was hosed by Sony so many times ...
I have quite a bit of Sony audio and video gear. And a couple of Sony still cameras, and several Sony computers, as well. And, indeed I have my share of failed Sony proprietary formats like MD and Memory Stick.
However, back in the 1970s, I caught myself from buying into yet another failed format: Elcassette. That was like the Phillips Compact Audio Cassette, except scaled up to use conventional 1/4 inch tape (vs. the 1/8 inch tape in the regular cassette).
I was seriously considering buying a recorder, but I asked the sales-gerb at Pacific Stereo about the availability of the tape cassettes. He told me they didn't stock the media, and the only cassette available was the one that came with the machine(!)
And I have several Sony VAIO computers which are now orphans since Sony is departing the computer biz.