You don't want dark tints unless you plan on never, ever, ever driving at night in the rain.

Heck, medium dark is already difficult on provincial roads, dark tint on the front windshield and the front side windows makes driving on them a nightmare.

Personally, I keep my front clear or use the lightest platinum available. I drive a lot on the highway, and the SLEX is pitch black at night. Even with very light tint on the front and HIDs, it's sometimes hard to see anything at all when it starts raining.