Like others said, do it if you want. I believe it looks better. I am running H&R springs right now and will upgrade to coilovers down the road. It makes it "feel" like it handles a little better, but it really doesn't.

Lowering springs are just for looks. Either get quality lowering springs or get high end coilovers.

 

This.

If you are rally racing or really doing any serious racing of any kind, you will be working out your suspension in detail anyways. If its a street car, all of these other objections dont apply anyways. Stock ride height is hideous.