PII vs PIII

It looks like the machine I have (an HP Kayak XAS, you may have seen me
mention it already) can be upgraded from a PII 400MHz to dual PIII 600MHz.
But the PIII's are substantially more expensive than the PII's, around $70
each compared to $10 each.

I guess I'm not that excited about a 50% increase in clock rate, by
itself. But is there a great advantage just in going from a PII to a PIII
with a comparable clock speed? Would I get substantially more computing
for the money?

--
"Is that plutonium on your gums?"
"Shut up and kiss me!"
-- Marge and Homer Simpson