Hi, Jeff. Do you think they would take a trade in on a Version 3.0? That's what I had the last time I hung drywall at my daughters farm House about a year and a half ago. It works great at my 1960's house but is at a total loss at her place. Thanks for letting us know that the 4.0 works better. If anybody out there knows if the Version 4.0 will work on lath and plaster, please let us know. And maybe the 2x4s turned the wrong way don't help anything. By the way, from the saw marks, I'm sure that some of the planks were cut on a water-powered saw mill.