imo, they're an essential basic piece of gear everyone should have in their kit.
my fave for talking heads is the oval 40"x60" http://www.amazon.com/ePhoto-Photog...B2JO/ref=sr_1_7?ie=UTF8&qid=1301675410&sr=8-7
my fave for talking heads is the oval 40"x60" http://www.amazon.com/ePhoto-Photog...B2JO/ref=sr_1_7?ie=UTF8&qid=1301675410&sr=8-7