Some say its not worth it.  I argue it depends (nothing new there).  Suppose you have a website that often has pages whichend up being temporarily switched on and off due to  things being in stock or not.  Well you could do a Javascript redirect, but oh no Google thinks you’re cloaking or instead you do a 301 header redirect but oh dear you are now permanently redirecting visitors before they’ve even read your content.  302s may be the solution as you temporarily pass credit to your money page until the regular page gets switched back on again.