If you’re looking for a long term relationship and are ready to take the search seriously, PerfectMatch.com is one of the best online dating sites available. Their Duet Total Compatibility System, developed by relationship expert Dr. Pepper Schwartz, uses a complex formula based on elements such as lifestyle, values, interests, and ideals to determine compatibility. 
With the focus on serious relationships, membership is pricier than many other online dating services but it’s well worth it.
Be prepared to set aside at least a half hour to take the Duet Compatibility Assessment when you join PerfectMatch. It’s an interesting and fun assessment that addresses everything from how flexible you are to your style of intimacy. One set of questions that I found particularly helpful was the “deal breaker” section, which lets you indicate characteristics you couldn’t tolerate in a partner. The result is a fairly detailed personality profile that reveals what you’re like as well as who you’re compatible with. PerfectMatch will then suggest matches based on both similarity factors and complimentary factors to give you a range of compatible potential dates.
PerfectMatch – Profiles With More
The profiles for other members include the usual photos and stats as well as their Duet Analysis, giving you an excellent snapshot of their values, interests and personalities. Most members also add a personal profile of their own that’s similar to what you’d find on other dating sites. For quick reference, you can refer to the Duet Summary, which gives a bullet point overview of similarities and differences. For instance, a match might be a risk taker with an optimistic outlook, relaxed personal energy, who seeks variety. He may differ from you, however, in that he is an extrovert who is willing to compromise rather than debate an issue.
There are plenty of extras as well at PerfectMatch.com. Dr. Schwartz offers relationship advice in a series of articles and answers member questions online. There are also a variety of polls and quizzes to keep things interesting.
PerfectMatch has obviously perfected their personality assessment and matching system, so you’re going to get some pretty impressive matches when you join, but don’t expect to be matched to hundreds of men or women. The focus is on quality relationships rather than quantity. I give the site bonus points, however, for giving members the option to browse if they want to. You aren’t tied to the matches made through the Duet system, so you can flirt and send emails all you want, just like a more traditional dating service. Bottom line? PerfectMatch.com combines the best of both worlds with their advanced matching system, outstanding advice, and an impressive membership of over five million.