ABM tremolo is head and shoulders above all other brands.
I have previously used Fender, Wilkinson and Gotoh, none come close to the quality of machining, chrome plating, smooth precision bolts and turnings and plenty of spares of everything. Spares include all fixing screws, alan bolts and even an alan key for adjusting the saddles.
The ABM 5050 series of tremolo also has a multitude of mounting hole and string spacings so very easy to pick exactly what is needed.
In my experience the cheaper Fender sounds tinny, the expensive Fender and Gotoh tremolos help to give a warmer sound. The ABM definitely gives a warm, rich and velvety sound.
Cannot fault this product in any way, from item selection to what you get and sound it give. Expensive but for me worth every penny.