A big pro is saving space as you can reduce your physical library's size.
You'll still have to allocate a little space as well as some human resource for the new service however.
For example:
- Additional Loan/registration/insurance considerations
- Charging station system for multiple devices
- Device support - Tuition & documentation, fault diagnosis, software updates and factory resets
- Warranty and out of warranty repair procedures
- Life cycle considerations - Device replacement/upgrade schedule and WEEE disposal of old/faulty devices
- Initial and yearly budget for this service.