I use the wrist strap version, but I find the strap slightly too short for my wrists.
However, the public access (non password protected) screen is useful if you are on any medicines that normally require you to carry a warning of their use. Also allergies, etc. If you are in another country riding solo and have an off/rendered unconscious, if the medics see the UTAG, then that would speed up treatment, identification and contact with your own doctor if required.
The language conversion options are quite a useful idea also.
Also, in the password protected section, you can scan in your passport, driving licence, insurances, passwords, etc. I think it has a capacity of 2GB in total.
Worth it for peace of mind I think.
Grey Beard