Do you think submit to directory is effect?

I have an almost defunct directory and I know that directory submission does not work. You need to build incoming links from relevant sites.

Yes, the key is to make sure the page of the directory you are submitting to is getting indexed on a regular basis from Google. Check the Cache date to verify this information and the more recent the better. Also Page Rank on the page is a great item to look at, high rank better place to submit.

I also submit my websites to directories, some of them approves links very fast.
I think they improve backlinks. There are some high PR web directories too. I think getting links (do-follow) from high pr directories increase page rank.

I don't think directory submission is effective in SEO.

You must send your website to quality directories to get back links which will help you to get high page rank and a huge traffic for your website.

The role that this directory submission thing can do for the site that yu0 have is make it possible for you to receive back links initially.

It is very essential to submit your article to quality directories, if you want to obtain quality backlinks to attain page rank and generate vast traffic for your website.

My recent tests indicate that a lot of "free" directories just reject free submissions and try to sell paid entries.

This is the most common way use by seo. Though competition have been increase it certainly pays benefit. submission good directory sites would help you to achieve your desire target.