If you are sending traffic directly from adwords, then it's no good tracking your traffic because they can steal your keywords. If you have a website or just a single landing page, then why don't use google analytics. It's free and easy. I've been using it since it launched and had no problem. The only downside is, it's not real time. It usually takes 3-24 hours. But in most cases it's less than that. I wouldn't use third party software that is hosted on their place because like I said, they'd steal your keywords. And sell it to the vendor for some cash.