Well I am a fan of Emofin. It is very good in developing the shadows. The low zone are kind of raised to give more contrast and the lights are slightly flattened out. So it is good when there is high contrasty situations which are difficult to control.
Some say it increases the speed of a fil. I would say it uses the speed well but doesn't raise the thoretical speed. However since it gives the shadows a bit more it does there raise speed a bit. It is good for pushing. Some complain it gives soggy/soft grain. I find it fine. It is not as crisp as some other developers but for low light or cotrasty lighting it is very good.