I am a special education teacher and part of assessing students requires video of the student "in action". This mount allows me to shoot a professional appearing video while interacting with my student.
The mount adjusts to various widths of phones. Even the venerable but small 6300 will be secure in this mount. I've used it successfully with the 6301 (North American version of 6300), the C7, the N8-00, the E75 and the 808 Pureview. (all Nokia devices)
The build is okay on this. With larger phones I am less convinced of how secure the phone is in the mount but after six months of heavy use it acts and looks like new and I've not had a phone "pop out" of the mount. (knock wood)
I've purchased two additional mounts for "one to use; one to lose" as my brother says, to ensure I am not without one when I need it.