I'm far from a reliable opinion on clamps.... I guess if I was I'd have just one type and stick to it,  I'm always on the lookout for alternatives... the main difference between me and the average Joe Blo, I am stupid enough to buy something new/different with the hope that it might work... there are many tools in my workshop that I would rate in the -ve.

Because of the bulk and expected weight of those clamps, I'd be a tad apprehensive of the small metal "pad" on the threaded arm, though packed would not be a major issue if you remember before the glue up starts and not have to ferret around for one in a panic... and personally I hate those rodded handles (or whatever they may be called)... the depth/thickness looks a tad limited.  I have a small collection of C clamps that never see daylight for that reason.

However, If you want/need a long reach any is better than none... sore beats a 10 kg dumbell sagging on some top's glue up.

Personally, any long reach (and the longer the better) is better than not having the option.       

If your first cut is too short... Take the second cut from the longer end... LBD