NLT speaks the truth about the RCBS - looks and feels flimsy as can be, but it does seem to hold up.
I used to have a plastic puller with a metal shaft - the head shattered on the second use.
Dillon, RCBS and Frankford Arsenal all make plastic ones. I paid $13 bucks for mine and it has seen a *lot* of use
Lee makes a collet type I hear good things about, but have never used one.
If you look around at gun shows, sometimes you can find one for less than 10 bucks. I saw two, the weekend after I bought mine.
BigSlick