Audio Note Kit 1

Bought a used audio note kit 1 300b amplifier recently. Haven't had a chance to listen to it yet. Any opinions on the audio note amplifier? Obviously build quality is of importance, being a kit amplifier. Has anyone had a chance to listen to there 300b built? System will be a sonore ultrarendu>chord2qute>audio note>15in audio nirvana alinco(open baffle). My current amplifier connected to this system is a EL34 Set Audio Nirvana. What kind of differences in sound character should I expect with 300b Set vs El34 Set. 
Better to spend the money on having a variable negative feedback control fitted.I have owned SETs with that option installed and it really helps fine tune the sound I imagine the Kit 1 has zero negative feedback and if you can dial in more feedback that would be most likely to both improve its control of speakers and lower distortion.Too much and you lose image depth but there is usually a sweet point that is worth finding.
Just a question here--I hope this is the right place to put it.  The Kit 1 originally appeared in the mid 90s I think.  I am wondering if it is time to at least evaluate if not replace some of the caps in an AN of 20-25 yrs?
@drrnc2 I will say my Kit 1 was built in 2010, and I've considered changing caps out of sheer OCD. If it was 20+ years old it would be the first thing I would do. I haven't done it yet, but someday I will. I have the AN copper film caps in mine. I will replace to the AN Silver capacitors when needed. They are pricey, but im sure worth it. Ive actually gone all out on my Kit 1 tweak wise. If anyone's interested ill give a list of things done to the amp, all of which has significantly helped the sound of the amplifier. The only things I see left are better ccore transformers and the silver caps.
Thanks akwilson501.  I was thinking that since the AN components are claimed to be so superior perhaps part of that superiority was long lived, but you, who seems to me to know a bit about the company, would see it as appropriate to do the replacement anyway.  Thanks again.  Rich.