I've been using Kitty for a month now. I really like it. It's slightly less usable out of the box than iTerm 2. The default shortcuts are very counterintuitive (no CMD T for new tab or CMD W to close tab). But editing the preferences is straightforward.

I prefer it to iTerm because it's so. Damn. Fast. It's the only software (besides Sublime) I run on my laptop that actually feels like it's using the 40 years of transistor improvements I'm paying for.

I know iTerm recently added a Metal renderer but I need ligature support, which iTerm Metal doesn't have.

Maintainer has also been responsive on GitHub.