I have an older version of the R&R setup (red, 36x48 stacking kit). Threaded rod is good quality, steel body is good and straight by my eye, clamps pads are fine but with a little slop relative to the slot in the body.(stays square to the body plane lengthwise but will rotate a little just before tight, does not affect clamping)
They are more than adequate for multiple cope and stick door layups on each pair of clamps and have been good for what little panel clamping I've done with them. I use the drill to snug then a box wrench to "feel" final pressure.
Made up a "portable" squared frame for the fixed bottom tracks and clamp down the rig to my assembly table when in use. Don't believe I've ever stacked high enough to warrant the use of top tracks.
Weight of each clamp is similar to same length pipe clamp.
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