I've had (what I think is) the Renpho Elis 1 for years and have been happy with it. Was like $20-25 from Amazon I think in 2018 and still works fine

Same here - £17 in the UK three years ago and it's been... fine.

It takes normal AA batteries (which I've had to replace only once), the results tally up with the properly-calibrated scale at my gym, and the app doesn't have any particular annoyances. I'm on Android, and it syncs fine with Google services, but it claims to do Apple Health too.

Honestly, it's one of the better pieces of tech I've bought in the past few years, and I don't see how a fancier / more expensive brand could be noticeably better.