Visitor looses track of which frame they are currently in. Content must often be crammed in to fit inside a frame. Benefits of Frames Visitor doesn't have to scroll as much More content can be packed into a single page. This technique is usually done for ad exposure. When visitors click on a hyperlinks they don't want to be subjected to a new browser opening up on their desktop.
Visitors feel a loss of control when new browser windows start popping up.
This is really annoying, takes up time, and eats up bandwidth. Don't make your visitors jump through a splash page. Visitors want quality information that is easily accessible. Don't insult your visitors by hanging out that obnoxious sign.