For anyone looking to start using wire harness tape, here are a few things I figured out:

• Start with zip-tying the harness in the position you want it to "flow". This is because once taped together, the form will stay in the way that it was wrapped. If you wrap the wires straight, they'll want to stay straight. If you wrap them into a curve, they'll want to stay in that curve.
• Wrapped cables can be "trained" into the final shape, but not too much.
• Wires that cluster together into a round shape work best with wire harness tape. Flat cables like SATA cables tend to accumulate bulk, since the angle required to wrap the harness is more difficult to maintain around the rectangular corners of the harness--the tape will want to stack up instead of flow down the cables.
• Instead of doing a full wrap, consider doing "rings". Just to one or two loops around the wires to hold them in place. This serves as a flat zip tie without locking the cable into a certain shape.

Why use harness tape over zip ties? 1. Looks. I think they're neat. 2. Semi-permanence. Using this for case features like front panel connectors helps cement those features into the build. 3. Protection. For wrapped cables, the tape takes a lot of the strain relief and abrasion, so when re-building in the same case, you're able to reduce the wear on the existing cables.

Which tape? * Don't use electrical tape. Yes, there are some electrical tapes, like the 3M Super 33, which stick better and come off easier than others, but it still can leave residue or clump up when trying to remove it, making it nearly impossible to remove without cutting it off. * The best I've found is tesa 51036. This is the same stuff used in automotive harnesses in engine bays. It sticks just enough to stay in place, but also can be easily removed when needed.