CJ Preamp Teflon Recap

Hello,

Have a Conrad Johnson Premier 16LS preamp.  Power supply went out so I sent in for service.  Have the opportunity to get it Teflon Recapped while its there.  Looking for feedback on sound characteristics and does it make the preamp more marketable if I go to sell it.  One friend said it "updates" the 20 year old preamp so its more on par with mid range preamps offered from CJ today - obviously the newer preamp offer other advancements but at least its upgrading the old preamp.  

Thanks, Troy