I also love the SanDisk cards. I went with an Ultra Plus and have not had any problems.
One thing that might influence your buying: It seems that there has been a rash of counterfeit SanDisk products sold on Amazon. In some cases these counterfeit cards melted while inside cameras or other products. I’m pretty sure this would void the Kann Cube warranty as clearly this is not A&K’s fault. So you would be out the money for your SD card and probably your Kann Cube does not work any more as well.
Better to do yourself a favor and buy directly from the SanDisk website. Don’t worry that when you type in
www.sandisk.com you are redirected to a Western Digital online shop. Western Digital merged with SanDisk several years ago and I guess they want to make it official now.
Also you get a warranty with anything you buy on the Western Digital web site, which likely won’t be the case if you happen to get a counterfeit card from Amazon.
I personally avoid memory cards sold by Samsung as I had many years of photographs saved on a Samsung SD card which then died resulting in a 100% loss of all data. But with music you often have many backups and a single dead SD card would not be a catastrophic loss like it was for me.
Happy listening