Vise-Less Work Support
Vise-Less Work Support attaches to any workbench or table and provides an upright clamping platform for comfortable, secure workholding while doing hand or machine joinery.

This seems like a decent idea, especially folks like me whose bench doesn't have room on either side for a woodworkers' vice and who can't put one on the front (I've got rolling cabinets under the bench). But I feel like I could build the same thing with a few bucks' worth of t track an some plywood. Woodpeckers is great for stuff that requires a high level of precision and machining. But this thing that they offer seems a bit over-engineered to me. What am I missing?