If you are worried about balance, you have no need to worry, many people use three point systems as by definition three points define a plane, four, a three dimensional space. Therefore three points will always balance weight distribution better than four.
If you have ever tried to balance speakers on four points, then tried some with only three you know exactly what I mean. With three points, you merely adjust the level, with four, you level the speaker, then play that famous dancing game getting it to stay stable..... That simply never happens with a three point system.
I don't like the three point systems as they can make it difficult to use balanced IC's or other wires in the middle of the rear of some components, but I've seen these and the shelves are pretty large so that shouldn't be a bug problem.
These are very cool looking racks, and as a cyclist I LOVE carbon fiber!!!
Ken Taraszka, MD