I love our 3 wheeler. I don't think stability is a problem at all. You steer them totally different to a 4 wheeler and you get used to the balancing points very quickly. I go up and down gutters and stairs and go cross country in parks all the time and have never had it tip over.

I also have a Bertini pram which is the first one I bought. It is a great pram but it is heavy and bulky and takes up the whole boot of the car which is why I ended up buying the more compact folding and lighter 3 wheeler.
It's called a bidwell and is totally different to the one they sell now.