I agree to everybody here that Ezine works best when it comes to Article Submission. Ezine is number in my list. When you ask how much traffic you can get from Ezine, well it depends on how many articles you submitted to Ezine and the number of clicks you received. Writing article is very critical, you need to consider the keywords from the title and to the content of your article. Dont make your article looks SPAMMY buy doing keyword stuffing. Its not good, follow what is fair.
Ezine has helped me a lot but the approval time is too long, sometimes over 2 weeks. Luckily I will reach platinum status soon which will help a lot.
I had an article that was viewed over 15,000 times. I just realised how little I have used Ezine recently.