If you have a genuine interest in the product. They are open loop PGP also so you can use them to mail other clients, able to fully customize the policies for the phones and push them to you via Admin control, i.e. you may want camera disabled or wifi. Various wipe features if in duress or stolen phone. Multi pass wipe up to 30 times. Secure Vault, nice to be able to verify your sessions with OTR auth and voice calls. International roaming sim for data all the time and communications for your staff and company.

A lot of law firms and such companies have been using them but also privacy advocates and even friends and people who like to exercise their right to private conversations.