i've seen several threads regarding coilovers vs springs on this board as i have seen on many other car enthusiasts sites. however, what i don't see a lot of is real data. what i'd like to encourage is a discussion from those whom have had first hand experience to contribute to the data and help those whom are interested in upgrades draw our own conclusions.

1. i think it's a given that aftermarket springs should shorten the lifespan of stock struts...but now that this newer model M has been around for awhile, I'm curious, how much did it really affect things? for people riding on stock springs, how long did they last? for people on aftermarket, how many miles did you clock prior to changing out the struts?

2. for those of you whom tout the infallible greatness of coilovers, i recognize their superiority for providing a matched strut/spring system, however, my understanding is that these strut inserts must be replaced or rebuilt at some point as well. what is that interval for the popular brands (JIC, teins) and how much did it cost?

3. for those whom have ridden in cars equipped with different types of suspension options to discuss as objectively as possible what they felt in terms of handling and ride quality. i think the drops on pictures already posted are self-explanatory as far as appearance.