You still have to be careful of the bar or bars flexing with multiple sheets or heavy papers.
I was using a new Rototrim profesional twin bar cutter and found 140lb wc rag papers, 22 x 30, would often need a recuting because of twisting so I eventually returned to the Stright Edge and water brush for better results.
The trimmer is difficult to use, exhausting in fact for five or more sheets at sessions.
Thanks Eli. I have plenty of experience using them. I brought one into my art/photo classroom (as well as a meat cleaver type) and used it to cut everything from tissue paper to matte board. Cheers!