And based on the LT3527 data sheet, Linear Technology basically copied what I wrote. They are also recommending ceramics for the switch caps.
http://cds.linear.com/docs/en/datasheet/3537fd.pdf
"Output and Input Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used to minimize the output voltage ripple. Multilayer
ceramic capacitors are an excellent choice as they have
extremely low ESR and are available in small footprints.
A 4.7μF to 10μF output capacitor is sufficient for most
boost applications. Larger values up to 22μF may be used
to obtain extremely low output voltage ripple and improve
transient response. X5R and X7R dielectric materials are
preferred for their ability to maintain capacitance over
wide voltage and temperature ranges. Y5V types should
not be used."
As I did, they mention Tantalum in context of using to provide large amounts of capacitance to support load transients:
"a tantalum capacitor may be used
in demanding applications that have large load transients."