IM's are pretty good in the rain but the corners of the door where it meets the front window may drip a bit. In a reallly bad downpour when it is bucketing you might get a bit more of an issue. A good microfibre towel is good to have around you use it also to remove some condensation if you suddenly heat the windshield or cool it with AC.
Sometimes though the great wipers can get over come by the amount of rain and you can override the wipers capacity but most times it is not an issue.
I have driven in big downpours on a motorcycle and that is definitely worse. 
Bob is right the VDO guages are better then the chinese knock offs but the lighting could use some help ... there is a new amperage bulb available to increase the night time driving experience.