Pros:

• It is a security key to prevent costly data breaches.
• Radically reduces IT support costs since you will be purchasing this once.
• It is supported by hundreds of the most popular online services.
• It is crush-resistant, waterproof, no batteries needed. It just works like a charm
• Easy integration with the open source software

Cons:

• No built-in tracking device so that it will be located easily when lost.