We have 2 trailgators – they do the job, but set up has to be spot on otherwise your passenger will be leaning over (a lot) or their handlebars will not be straight. The clamps do mark the kids’ bikes too. Hitching is a bit fiddly but not too bad. I tend to leave the hitch on one bike. They are cheap, especially second hand. The clamp that holds the trailer bar when your kids are riding on their own really needs flat drop outs – I’ve got cowled drop outs on my bike and this makes it fiddly to attach.
I’ve not used the Follow Me, I think I’d have to see one in the flesh to see if it’s worth the money.
Niggles aside, they do the job and let us attempt longer rides knowing that if the kids get tired, they can have a tow.