I have had bad luck with Tokico in the past but I am not saying they aren't any good.
First off they are not real "coilovers" as they are not ride height and camber adjustable but they do come with dampening settings so that is a plus. The price is not bad for what they offer. It says that they come with lowering springs but it doesn't say how much it lowers your car.
Here is the link to their homepage
http://www.tokicogasshocks.com/products/dspec/#
I don't know of any Nissan owners to use them but I do personally know a few soobie guys running them. Try'em out and let us know!