Features of eHarmony.com:

Over 15 million registered members
10,000 - 15,000 new signups every day
Over 90 marriages a day as a result of joining eHarmony!
Split into two sections - one for singles to help you find a match, and one for married couples to help strengthen your relationship
Matchmaking site rather than dating site. You fill out a detailed questionnaire and they find matches for you. You will not have the ability to search the members' database yourself!
Compatibility Matching System - The initial questionnaire you fill in when you join will be used to find matches for you. This is an extensive 436-question questionnaire based on 29 different criteria.
eHarmony is based on the Compatibility Matching System developed by Dr. Neil Clark Warren, a relationship expert with over 35 years experience in research and private counseling (it was granted a patent in the US).
Once the system returns matches for you, you may initiate contact using a guided communication system, comprising of more questions and answers, or proceed straight to a Fast Track mode of communication.
Most subscription packages include a match guarantee.
No need to pay until a match is found for you and you wish to communicate with the other person
One of the very few dating/matchmaking sites with more female members than male
You may only search for the opposite sex. This site does not cater for same-sex relationships.
Recommended for long term, serious relationships only - not for casual dates or simple flirting!
Excellent technical support.

eHarmony Dating

Unique Features of eHarmony

What makes eHarmony different than most other dating sites is the premise of the site: their matching system. This means there is no search engine, and until recently no way to even see a potential match's photo before making contact.

Many users have complained that eHarmony never has any matches for them initially, which I have personally found to be true as well. There is an easy fix to this problem however: sign up at eHarmony, fill out the questionnaire and demographic information, get your personality profile, and then leave eHarmony alone for a while. By the time you start getting matches (you'll get an email each time the service finds someone compatible with you), you'll also have received several emails offering you a hefty discount to use the service. I wouldn't recommend anyone subscribing to the site without having at least three matches, since oftentimes members don't respond (also in my experience). Then, wait until you receive an offer in your email box, and sign up at that time - and not a moment before.

I highly recommend eHarmony for heterosexuals serious about finding a long term relationship as long as they are aware of the drawbacks listed above. eHarmony's track record is incredible, and their success stories are increasing exponentially, with 90 members getting married every single day because of the site.