We've got the Corsaire XL, their biggest one. We haul two two-year-olds to daycare and back and I love it. It's really sturdy, and so far the kids have plenty of room. The section in the back for holding items is bigger than I expected it to be and they have all kinds of leg room in there. The only attachments we got were the fenders because we planned to use it in all kinds of weather (although I was a puppy last winter and we didn't bike because the kids were too young to tell us if they were cold). The hitch is great - the trailer comes off in seconds. I swing by the house on the way to work and drop off the trailer - takes no time at all. The kids love it, too.