I should add a little more to my rather selfish reply earlier as I have now managed to look at these in a couple of shops
The Chariot Cougar looks really good and can see why it costs more than some of the others. They also look to hold value well so get a lot of outlay back when come to sell.
BUT the Croozer looks excellent too and in some ways I prefer the sling/bucket seat over the others.
I was hoping to find a trailer that I could use with my son on his own set up in the centre and also use as a double with friends children and his cousin. It appears the design of the Croozer for 2 means can’t centralise the seating position. If you want to always use it for two then I see this as a bonus!
As others have mentioned the Croozer for 2 is pretty wide, widths as below:
Chariot Cougar 1 67 cm
Chariot Cougar 2 80 cm
Croozer 1 74 cm
Croozer 2 90 cm
Burleys look pretty good and very well put together but appear to me at least to have a higher centre of gravity and many have smaller 16″ wheels.
The fact that the Croozer comes with the jogger and stroller is a massive bonus.
I will probably go for the Croozer for 1 and then let others hire a trailer from the centres we normally use.
Also if find it a little too bumpy will look to see if can swap the tyres to Schwalbe Big Apples or similar.
Review here with a load of photos, (written by shop owner I believe):
http://www.whatbiketrailer.com/croozer-kid-for-2-review/%5B/url%5D