Sigh...don't do this, don't do that...
I'll at least give you an answer. I had a '03 SpecV show car with a fairly impressive sound system in it. I had an Optima yellow-top in it. It then got transferred to at least 5 more vehicle, including an Audi A4 1.8t and a Mazdaspeed 3. So yes, to me they are worth it.