Had a tag along for many years with my kids, it was fantastic would recommend.
Gave my two a lot more confidence and leg strength to transfer to their own independent cycling and meant that when they were little we could go much further afield than we would otherwise.
Make sure you link it to a bike with decent amount of low gearing as you’ll notice the extra weight on hills and the kid won’t have enough torque to really help you out like they do on the flat. I had mine on mymountain bike
If you get the right conditions and a willing kids though the flats are great, there was a run where I used to free wheel and eldest tried to keep pace with her mum just with her own pedaling.
Only Downside is they go grow too big for them, once you’ve raised the saddle to max that’s it so it might be worth checking your kids legs fit if poss before you buy.
