Completely agree - armlock is great for practice. Going from armlock to traditional really helps my traditional stroke.Ordered a Odyssey Armlock from CPO and have played one round with it and rolled it at home a fair bit. One takeaway is that even if I don't end up playing this as my gamer it is very beneficial for your stroke with a normal putter as well to practice with the armlock. Teaches to take the hands out of it which is my problem (too wristy).