I was also just in the market for a small experiment robot. I got the hiwonder armpi-fpv. Avoid it, the actuators are pretty bad - they're very 'grindy', the robot jitters like crazy when it moves. Any such problems with the lekivi?
Hmm I've never used the hiwonder servos so I'm not sure how they compare with the feetech/waveshare STS type, but these have been surprisignly good overall. There is still considerable backlash which results in a cumulative 1-2cm of gripper translational error when accumulated along the arm, but the control is really stable. I don't think there's any jitter at all. They are a bit loud when moving at max speed, but there is also a STS3250 brushless variant that's stronger and really quiet. Expensive though.
I haven't tested the Lekivi specifically, but lots of SO-ARMs and a custom built lekivi-like robot. I think some people have had some issues with the rear omni wheel when moving forward but I haven't seen that myself.
