frist of all
wht u want to ask

r u saying it is good for site or u asking is it good for the site..

a/c to me

it is very usefull to the site...
it increase the traffic and CPM for the google adsense..

u can use other traffic increasing method
link

link exchange
e-mail marketing
ezine
SEO

and other..



wish u best of luck.... for future earning..