It's ok. It is very slow to update stats and is not very easy to find information, but at least it's an alternative to what we had.
MSN adCenter is very good for me... better than overture imho but far from google. Their traffic is very good though and converts nicely... I say it wouldn't hurt to try them out at all.
For me, yes but it is different for every market. The only reason it's better than google for me is because of the low cpa... google can deliver way more traffic than msn though and can get faster results.
Overture ads stopped displaying with adCenter when they launched on May 4th 2006 they are only serving adCenter ads on MSN.com and search.MSN.com
AdCenter is converting pretty well for me. Even though I have only ran 2 very small campaigns. My keywords list was tiny and broad...but the traffic still managed to convert well. Can't wait to invest some time and money into it to see what it can do.