OK, back to the amp stand for a bit...
It arrived today. The top and bottom plates are made of a high density polymer plastic, designed not to be able to twist or deform (said to have high modulus). I couldn't twist them or bend them at all. The tubes themselves are metal, and they slide nicely into the special rubber sockets - you don't have to use large amounts of force to get them fully in. For tilting the stand, there are well-made plastic extension plugs that slide into the tubes, and click into place with a good push. You add these to one or both ends of the front or back tubes to achieve a forward or backward tilt. Despite the weight of my cab (about 60 pounds, the stand is rated to 100 pounds) the cab doesn't slide on the stand, and the rubber cushions that come into contact with the cab seem just the right consistency to hold a cab in place. There are also rubber cushions on the bottom for hard floors (my room is carpeted).
I decided to put my Mesa Rectifier 212 cab on the stand and use the shorter extensions to tilt the cab slightly, so that the front edge of the cab is 5.5" off the floor, and so that the speakers aim a bit more toward me. The stand is 17" wide, the perfect size to clear between the metal slots attached to the cab to hold its casters, and the cab itself extends a little over 6 inches on either side of the stand. The balance seems just fine, however, it isn't necessary to put the stand together with a tilt, and there are several tilt angles that can be created.
Here's a shot of my studio with the cab on the stand. Makes for a clean-looking setup:
Next to come: Tone report!