Some might think this is cheating, but I love it. It positions my hands perfectly and makes jointing a edge a ton of fun. I don’t have to be obsessive about checking my edges and it helps me move my jack or jointer plane with easy. Most importantly, it gets a square edge ever time.
It also works nicely on end grain.
The only bad news is that its kinda hard to find and collectors like them, which can make them expensive. If you’re willing to take one that missing a knob or otherwise not in perfect, but working condition, you can save some money.