I have had no problem with Aristo knuckles. I also like LGB's knuckles, but they are hard to find now. The only experience I had with Kadee couplers on my railroad showed me that unless I wanted to rebuild the whole thing, I should stick with what works for me. Truck mounted, oversize knuckles. Not impressed with the USA knuckles, had a pair of USA 44 tonners keep separating when trying to handle a long train.