I had a Sony point-and-shoot that used Memory Sticks. They worked fine.
But I've since moved on to a Nikon DSLR and CF cards.
I used to like Sony, but lost enthusiasm when they tried to kill SACD. If Sony had handled the format better, we might all be enjoying great hi-rez recordings now. That might be partially fantasy (considering the Loudness War) but consider the way things could have been.
Considering proprietary lock-downs, BMW is the company I love to hate. Electronics turn over every couple of years, so waiting 12 months and going to a better format isn't a big deal. But vehicles are (to me, at least) long-term investments. If BMW was non-evil, and supposing they made reliable vehicles, I might buy one.