I tried it when I was a novice and it was a complete waste of time. This is one of the more sophistcated Traffic Exchanges, so you can see how bad the others are. Dont even think about it, it's the same as buying traffic, a complete waste of money.
I think they are ok. You just need to know how to promote on them. You need to realize what people are doing there (surfing for credits). So selling a product is no good, and maybe even getting them to opt in to a page isn't going to work. In my opinion you need to give them a better way to get traffic rather then surfing. So if you give away a traffic e-book or info on how to get traffic without surfing then it will convert better. Also keep in my that most of your traffic exchange users are new to the Internet marketing world.
You use one of the most dumped on products ever ...in fact I think Google banned them.... and yet you offer SEO advice...... LOL LOL LOL Thanks I needed that.....