Yahoo and MSN?

Hey guys

I've started to move my profitable campaigns from Google over to the other engines. Whats your experiences like? I'm getting some funky results. MSN converts like crazy some days and then switches off completely on other days, Yahoo will disapprove stuff really randomly. Still trying to figure out their quality score.

Do you guys actively use the other engines? What are the 2nd tier engines like?

Yahoo and MSN should be fine, but stay away (IMHO) from the "2nd tiers" - I had to get my bank to manually reverse $100s in charges from Miva and one of the other "2nd tiers" (can't remember what the other one was...).

You won't get near the volume from them anyway, and I think Amish said it himself that Click Fraud runs rampant on the 2nd tiers.