Unfortunately they are all not as good as they can be. They should dim more, and the sensors need to be more sensitive. They are very directional, and basically need the headlights aimed at the mirror for it to respond. All you can do is make sure the sensor is clean, and that the rear window is also clean so that the sensor gets the best chance at working.
You could get a stick on prismatic mirror from most accessory shops and stick it to the windscreen. They lool just like the "old" manual dipping mirrors. What you would have to do is turn your standard mirror up (you can't take it off because there is the wire to the LCD panel, and the rain and headlight sensors are built into the base) and then stick the aftermarket one below it. It may not look the best however.
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