Thanks everyone!
Quackner: Yep, not a big fan still since I (feel the) need to drop everything else to get them done. At least I'm not totally without the usual inventory I want for the season, but when I'm talking to a client I hate to say "no" outright and at least I could defer the build with them being ok with that, but then it bugs me!
Steven: The thing I don't like about these clamps is the nuts. They are great for quick adjustment with the tilt and slide, but unless they are then tightened a bit, they'll fall off while wrestling the others. Need four people, one on each corner to position and tighten.