Confusion about UFI

[jonathan_golles]

Hi,

I'm running non-UFi images on my ICX 7150 switches and I see a warning on the SHOW VERSION command which says 

WARNING:  image is not booted from UFI!!! Please download UFI image and reboot the system for full functionality

According to Ruckus, a UFI is:

A unified forwarding image (UFI), consisting of the application image, the boot code image, and the signature file, can be downloaded in a single file. 

My switches have been running stable and I'm not missing any commands or functions I know of (or am I missing boot code and the signature file)? 

My question is: can some explain further what UFI is and what the practical differences are between UFi and non-EFI images? 

Are there good reasons to use UFI images to upgrade firmware moving forward?

Thanks