Surprisingly Kiro is fine (I work at Amazon but not at all on the Kiro team). I prefer it to anything else I've tried (except Amazon Q Developer in IntelliJ, but it's now deprecated).

Kiro is surprisingly good, if the interface for saving and resuming was slightly more reliable, and there was the hope of remote sessions, I'd probably switch to it full time. I vastly prefer it to having to fight against buggy force-fed features like UltraPlan or whatever.