I have been on Christian Mingle for almost 6 months.  My impression is that this site is for the curious and not the serious.

First of all, 80% of the members on this site never even bother to post a picture.  And, 25% of the emails that I send to members are never read.  But, the site is cheap to use.

Word of advice.  Find a site that is more expensive as those members tend to want the most for their money.