I don't see anything wrong with a harness.
But suicide seatbelts .. why does it reach over to the A pillar instead of crossing your chest and going to the B pillar?
Babbling about legalities and mods and stuff, some people perform illigal mods because they want the positive effect of that modification, and can justify breaking the law for it. Some things are understandably dumb, so people don't care. Like window tinting. People get 15%, 10%, 5% because it provides the look and privacy (+ whatever else) they want. People don't do it just to break the law.
But these whacky seatbelts, I havn't seen anyone retrofit suicide seatbelts. Why? Because they look stupid and useless. I figure most people can appreciate the purpose of, and understand the working of our normal seatbelts, so looking at this design just results in "WTF?".