[Elecraft] K3 to K3S Upgrade Opinions

[Frank]

I have a K3 with dual receivers that I purchased 5 years ago at Dayton.  
It is the best radio I have ever owned hands down.  My main use for the 
radio is chasing DX.

I have read all the marketing materials about the improvements the K3S 
has over the K3.  On paper and in the lab the radio is an upgrade.  But 
in day to day operations at a home station can an operator tell the 
difference between the two radios?

Those who have upgraded what is your opinion?

Would you upgrade the K3 with new parts or buy a K3S and transfer modules?

I am leaning toward NOT upgrading the radio as the K3 seems to work 
great.  Am I missing something?

Thanks for taking time to reply.

73,

Frank

K6FW