Agree that these are the absolute rolls royce of panel clamps
I have 6 of these bad boys. Have used them for over a dozen panels so far of various lengths and depths. All came out dead flat and with a little sanding they are just fine. No biscuits, dowels, splines or dominos required, just mill, apply glue and clamp - simple. The only thing you need to watch out for is that you DO NOT add too much clamping force; they don't take much to get them clamped up tight. Great if your hands are not what they used to be.
And as others have mentioned built like a brick s***house!!!