We've got one. We use it attached to a Dawes City Vision towing an Islabike Cnoc (16" wheel).
All connected, it rides nicely, very solid. My 5yo daughter loves it and I feel she is quite safe on it. Her bike stays upright and follows my wheel truly. It doesn't feel at all like it would jackknife, as it relies on it's own damped pivot to turn instead of using the childbike's steering like other towbar arrangements that I have seen.
I carry two big panniers as well. My daughter doesn't have to pedal, but she can give a useful turbo-boost up hills, and she can also apply her brakes when necessary.
It takes two minutes to connect or to disconnect the childbike and hook the Follow-Me up. This feature means I can let my daughter ride by herself offroad, and then hitch up to go along a road. Today we're taking the whole caboodle on the train for the first time, but we've often cycled together to the station, then disconnected my daughter's bike and brought that only. I've also gone and retrieved my daughter's bike a few times when she hasn't been able to ride home eg from the swimming pool (tummy cramps).
So... it's fab.
Now the downsides:
It's heavy. About as heavy as my daughter's bike. 6 kilos or so? The motherbike has to be sturdy to cope, and you wouldn't want to ride around with it hooked up if you didn't absolutely have to. BUT...
...taking the Follow-me off my bike takes about 6 minutes, with practise (which is an age if you need your bike naked to dash to the station on); and requires brute strength that many people would not have. Even so, if you often take the Follow-me off and put it on like I do, there's a serious risk of injuring your wrists (which I did). After resting my wrists for six weeks I got round it by using my knees to brace my arms to pull the bars of the Follow-me apart.
When folded up on the motherbike, the Follow-me sometimes bashes my Standlicht, it would break it if left to do that. Follow-me will sell you a piece of wire for £15.00 to solve this problem. I fixed it myself by tying it carefully.
The fixing that stays on the childbike is really awkward to get on. The first one broke, predictably, because it's flimsy. The second one worked, but only after cutting my hands, predictably, because it's a sharp-edged strip of metal. Now it has slidden down the childbike allowing the front wheel to ground out. I'm not looking forward to adjusting it.
It rusts.
In general...
It looks and feels like a prototype or a beta, but ****if you are handy enough and strong enough****, it rocks.
