Dom,just the weight savings on the drive system is worth it.
You can buy the stock size aluminum pullies between the PS,WP & Alternator it's worth 3-4lbs rotating and dead wieght.
If you think 3-4lbs is not that much next time your at the grocery store pick up a 4lb package of sugar.
For the prices parts are going on these cars you couldn't buy stockers for the price of the aluminum pullies.
Pete