If you don't want 5 euro copies, schaller is great.
+it looks and is packed just like a gift, just like a jewelry. very nice. the security mechanism and parts look very smart and high quality.
-i think the cheap copies do as well as this one. it is more about look. on the other hand, this is automatic functionality so you don't need to release button when you put it ON (only when putting OFF). however i had hard times already when using it, it was kind of stucked. finally, if you have it mounted on neck near body, the knob is so big, that it can really block you hand from playing. for this reason i will consider putting it off, i want my guitar safe but not for the sake of playing. or i need to put knob somewhere on body directly.