The link is just to google translate as far as I can tell. But this should answer any questions you have about magnetic locks (specifically it should answer this question): Everything You Need To Know About Magnetic Locks

The thing about locks...or really anything, is that you should be given all of the info and decide what works for you. It is true that some designs might not be practical, but they may work for you. The forever lock is a great example. That thing will not break but it is a little hard to use (seriously though that thing will not break, a guy on youtube keeps putting liquid nitrogen on it and hitting it with hammers), still you might like it and be willing to take the time to open it.

Really it comes down to what you are comfortable with. If anyone wants your bike really bad there is only so much you can do to stop them. At least be comfortable with your own lock.