Until now I hadn't really given much thought to Conductive Polymer Caps in my SE/30 logic board recappings mainly because SMD tantalums look great and will last for decades (assuming reasonable temperature, humidity, and no voltage spikes). But this thread does make a good point about Aluminum Conductive Polymer Caps offering a "stock" look, especially for those among us who keep their SE/30's open enough to care about such things or who intend to sell boards and expect a higher selling price as the result of a "stock look." Here's a set of excellent information that can help you decide if Aluminum Conductive Polymer Caps fit the bill for you:

General Overview of Polymer Capacitors:

http://en.wikipedia.org/wiki/Polymer_capacitor

An excellent set of info on polymer caps, especially when replacing "wet" electrolytics with them:

http://www.capacitorlab.com/capacitor-types-polymer/

Life Expectancy vs. Temp. & Humidity (see pg. 5):

http://www.cde.com/catalogs/SPAAppGuide.pdf

Various capacitor technologies compared:

http://www.bundertech.net/cap.php

Nichicon Conductive Polymer "Long Life Assurance" Aluminum SMD caps:

http://www.nichicon.co.jp/english/products/pdfs/e-p_cs.pdf