OK if your cassette deck is an old fashioned "manual" deck with a big lever to press to eject it, but don`t use on an electronically loading deck as they can cause a lot of expensive problems, including combustion !!
had mine nearly 4 years now and no problems. it has no wires it is just a cassette shell so nothing to get stuck.
The problem is that they are fractionally larger than a standard cassette unit, and where they have been copied / molded / mass produced over the years, the physical dimensions have changed, not by much, but enough to cause a bit of drag and resistance on the cassette cradle where they are inserted, and thats without the challenge of any wires getting in the way.
Manual decks are not too bad, you just have to press the buttons a bit harder to eject it, whereas electronic decks may struggle causing the plastic load gears to shatter. Yes, I know that many of you will reply by saying that once its in there, it will stay in there, but unlike a mechanical deck, if there is a power outage or detected fault with an electronic deck, it will often cycle the cassette in and out again, often without your knowledge, and this is where the problems can arise. We still see a lot of cassette units here for repair, as MP3 is still notoriously hard to accomplish in classic cars.
I know of at least 2 units now where the load motors have overheated whilst this was happening, and because the fuses in the rear were "upgraded" due to poor maintenance, the dash caught fire on both occasions. One superficial, one was a write off. Ok, its rare, but it can happen.