This is just my opinion based on my research. It's not advice or encouragement or anything.
I have not tried full suspension because that's only something you "try" when you're ready to ctb. If it's done right (i.e., the right rope, a strong anchor point, etc.) it's 100% lethal. Based on what I've read on SaSu, people fail because the rope is too weak and snaps, the anchor point is too weak and breaks, or they don't give themselves enough time and someone saves them.