Why use conductive polymer aluminum solid capacitors?
They have ultra low ESR, are very temperature resistant, long life, and a high ripple current capability. You have probably seen them on high end video cards and motherboards. Polymer capacitors have lower ESR so you can replace wet electrolytics with them but use about half the capacitance value.
I uploaded some pictures of a Dell Optiplex GX-270 that I recapped with Polys