[Elecraft] KIO3B Upgrade for K3 question

[Gary Smith]

I've built a K3 as a kit and added many 
options as a kit so it's not unfamiliar 
territory. That said, what is a reasonable 
amount of time to add a KIO3B Upgrade with 
its three boards?

And other than not needing an external 
soundcard and only requiring a USB cable 
instead of a RS-232 to USB adapter cable, 
what is the benefit over the existing 
hardware in the K3?

Thanks & 73,

Gary
KA1J