A PPC company that is a partner of Google, Microsoft, or Facebook has a representative you can speak with directly to fix issues right away, rather than having to wait for a support request to be resolved.
If you don't have a strong response when a PPC agency asks you about your goals for your paid media campaign, a reputable agency will tell you how to design those ads after you've decided what you want.
Any PPC company you speak with will outline the significant difference they can make for you. A good PPC company will outline the modifications they want to make for you along with the data they analyzed to support their findings.
In order to find a decent PPC agency, you should look for someone that has experience in your sector. You don't necessarily need to find an agency that just advertises for bolt makers if you make bolts, but you should look for firms that frequently operate in manufacturing and have experience marketing highly complex B2B items.
