That was not my impression, at least for the Streamliner DLX. Granted that impression is based solely on yanking on the rack, but despite the light weight, it seems to be one of the stiffer racks I have handled. It is definitely stiffer than my Blackburn EX-1. The Streamliner Road DLX seems like it might be a bit more noodly because of the lower mounting hardware, but I have not seen that rack in person.

To be clear I am not advocating putting 110 pounds on it.