We bought the Buggypod OK for our BRIO Go, because friends of ours were very enthusiastic and we wanted neither have a double buggy, even a board wanted / seat between your legs. After consultation with the representatives of Buggypod we knew that this model suits our car.
The delivery was prompt and the Buggypod is really stable and makes a great impression. He also snaps easily and perfectly. The mount and fold is easy to handle daily. Sure, the first assembly is a bit fumbling but then everything fits perfectly. We have the Buggypod mounted on our Brio at the lower basket. So the Buggypod is now not so much. Our son is 21 months and weighs 11 kg. He is very narrow but despite snowsuit etc. still thick air. So really not an issue. Sure, it's not buggy width but our son loves it in there to sit and found it totally cool.
So, the model is unstable in any case and therefore recommended super at least for the Brio Go!