WBT Banana Connectors

I recently acquired some Canare 4s11G to make speaker cables. 10ft runs, for JBL L100s and a Marantz 2270. Has anyone used, or a fan of the the WBT Bananas? I am considering the copper version, silver a bit out of budget. Also would welcome hearing experiences on working with them making cables. Thank you!

https://kimber.com/connectors/wbt-0610cu