It's rated to haul up to 300 lbs, or cargo up to 15' long, like this full size canoe.
Here I was helping a friend move a sofa about 1.5 miles over mostly flat terrain. The sofa was nearly 8 foot long. If it had gone on the truck, it's footprint would have taken up nearly a quarter of the available floor space, making packiing the truck significantly more complicated, if it was still possible. Over this distance on a bike, I arrived just a few minutes later than the moving truck did.
I'll be posting more photos and impressions as I have more adventures. I can already say that I'm pleased with this new human-powered hauling option, and expect to find plenty of uses for it.
While Becky hopped on for a test ride, I didn't actually haul her the whole way. Others have already pioneered guest-on-couch hauling.