AudioQuest Niagara 1000

Any comparisons between the 1000 and 1200?  There looks to be about $500 difference (used 1000 vs new 1200), I don't need the extra high current capability now, is there any other functional/design difference?  What about outcome in SQ?

The comparison is made very clearly on the AudioQuest website.

The 1200 model has much better isolation specs noticeably quieter,
and build more robust and can be positioned several ways 
requires a good power cord to get the most out of it . I went to VH Audio 
bought Furutechs excellent 6-9s occ  awg Copper and Furutech connectors 
for under $400  will compete with cables 3 x the cost .

The 1200 does not alter the musicality flow of the music ,it for sure lowers the noise floorand presents better imaging and soundstage width and depth.
nit like most conditioners using mov for surge suppression, and most use Brass connections which suck. AQ uses Silver over Beryllium Copper even on the input 
and quality copper wiring they do things right. I have the same philosophy 
i took anything Brass in most speakers and amps Brass . I use only gold over Copper throughout my system same with wiring foamed Teflon Litz solid core 6-9s Copper throughout VH audio has some excelllent wire and Quality copper connections.

Please note: don’t judge the new AQ 1200 until you get 100 hours on it 
for all the capacitors,wiring,and connection needs to runin. 
That being said within a few hours you will hear better resolution   maybe a little bright at first, which fades after the first 50-100 hours.