I definitely do not want to install proper straplocks on my guitars. I don't gig, so I can get by without the very best in locking technology. These are quite easy to attach to the guitar and do function perfectly.
However, I have had them falling off once or twice, and therefore need to deduct one star. However, I noticed it immediately and just installed them again. If you are gigging, you can not stop the gig to replace a straplock.
The biggest advantage to these is that they offer some protection, while not needing to modify the guitar in any way to accommodate them.