I had one and found it to be a total faff to use. I quickly learned not to install it with the pin through a hole in the disk, good luck removing it again, you could be there shaking and jiggling things for ages to get it off, no chance if it was on the side stand, easier on the main stand. I then installed it so it would engage a disk hole if the bike moved as it’s sprung loaded. I also had issues getting the key into lock, never mind turning it.
I eventually give up on it, the only person it stopped taking the bike was me, so it was removed and moved on.
I think they are a much more secure option than a disk lock or chain, but ease of use and reliability do not make it a viable option for me.