I'm thinking of replacing my Rapidos with knuckle couplers but MT couplers are pricey and seem tricky to install, plus I don't need automatic uncoupling anyway. Unimates seem like reasonable option and easy to install, but I don't know much about them. Does anyone have experience with them? ease of coupling/uncoupling? reliability? and what shank length should one get for passenger cars and rolling stock and locos? any advice welcome.