I have a Kora Flash, which is essentially a lower power version of the Mercury and without a remote. IMHO, all of the amps you mention are great, although I personally feel that the Cary SLI-80 is not in the league of the others that you mention.
I absolutely love the Kora sound - I have owned a lot of gear and listened to even more, and somehow the Koras just seem to have a really nice balance of resolution and clarity, yet remain coherent and very musical, and just natural sounding in general. I have heard better/bigger soundstaging with other gear, but the layering/image placement and image density/image definition with the Koras are phenomenal.
On that note, my general experience with Kora (and I have had exposure to a lot of their products) is that they can be a bit fussy. The designs are unconventional. And they have nearly nonexistent US presence (currently), so if you need help and do not speak French then things become difficult very quickly.
I absolutely love the Kora sound - I have owned a lot of gear and listened to even more, and somehow the Koras just seem to have a really nice balance of resolution and clarity, yet remain coherent and very musical, and just natural sounding in general. I have heard better/bigger soundstaging with other gear, but the layering/image placement and image density/image definition with the Koras are phenomenal.
On that note, my general experience with Kora (and I have had exposure to a lot of their products) is that they can be a bit fussy. The designs are unconventional. And they have nearly nonexistent US presence (currently), so if you need help and do not speak French then things become difficult very quickly.