We have the Burley D'lite trailer and could not be happier with it. We have hauled our son in it many times for rides as long as 40 miles. It is very well made and roomy. A few times, we've taken other children as well and it's a little cramped for two kids but the kids seem to like riding together in it. The trailer collapses easily for transport and tows great. We've had it in excess of 40 mph behind our tandem. It makes for a very stable ride.
If fact, I was so impressed with the D'lite that I later bought the Burley Nomad cargo trailer. I use it for touring and groceries.
Dave