For me it was clearly 2 selling points:
1. The price!
2. The combination lock, where I can not lose the key, as with any previous lock)
(Hence also determined suitable for children)
For safety, I have to say, well someone who has the appropriate tools now need only a few seconds to crack, but here you have to be a realist, because who wants to steal something, who finds his way to it! This castle has at least already created a barrier to thieves in affect!
I can recommend it from there, for my 10 year old bike it was good enough!