[Elecraft] K3: Any gain with a new synth?

[Bill]

My K3 is from early 2012 - ser: 62xx. I don't contest or DX - just rag 
chew on 160/75/40 - makes a super 500 Watt station. Rarely do I touch 
any controls other than the VFO or band switch. My QTH is very low noise 
- typical local daytime noise level barely registers on the P3 (think 
S-0). Yeah, I know I, I could be using something that cost far less. I 
enjoy the Rolls Royce!

Now that there are a fair number of K3S rigs and modified K3 rigs in  
the field - there should be something for me to learn from the users.

Considering my use of the K3 and my QTH - what would I gain by 
installing the new synth  (KSYN3A) in the existing K3? I am looking for 
real-world 75 meter LSB experience. Wife says go for the K3S if I want 
to, but I think it is overkill for what I do. Yankee cheap I guess.

Gotta say, however, the K-Line is soooo easy to use and is - without a 
doubt - the best rig I have used in 55 years on the air.