I’ve got one. It’s adequate for light use.
The seat is pretty basic and doesn’t look terribly comfortable (we sometimes stuff jackets etc under it for a bit more support) but my daughter doesn’t seem to have been too bothered by it.
There’s no suspension other than the tyres, so it’s not really suitable for anything more than fire roads. The wheel fittings are pretty cheap and nasty, but they work.
Waterproofing is completely non-existent: anything more than light drizzle and your little passenger will get drenched.
You can stuff a few things down the back of it, which is helpful, but there’s nothing to stop things just slopping around in the “floor” and not much to keep anything from falling out of the back either, so you have to be careful.
The other slightly odd thing is that it’s asymmetric (presumably they economised by using the towing arm from the double version) so you have to try and remember which is the wide side when going through gates or along the edge of a path. If you need to go over stiles etc then it’s a bit of a faff, but doable.
So you can sort of muddle by with it, if you take it to the right places in the right weather. Fundamentally it’s one of the cheapest ways to get a trailer, and my daughter generally loved riding in it. We used it from when she was 9 months to two and a half, when she started riding a Cnoc towed on the back of my bike, and that’s generally much easier than using the trailer.
Haven’t yet decided whether to sell it or convert it to cargo use 🙂