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I have a follow me. It is solid af, I really rate it. Great to be able to attach and detach the bike in a few seconds, means you can switch up between pulling them along and riding side by side over the course of a ride. Defs not cheap but they don’t really lose value too much, so you should be able to recoup a lot of the outlay. Admittedly that will be a fair few years down the line.
I have. Child has an Isla.
It seems to be the market leader and it sounds like the seatpost ones aren't great.
Not cheap though.