It seems unavoidable that if we have filters and tick-boxes for features and likes or dislikes, we could be cutting off literally thousands of potential suitors because of something we might have thought minor or irrelevant if we met in the flesh.
And, by the way, the tick-box that chooses whether you’re shown people with children or not can have an even more dramatic result, with 90% of the people I asked (a straw poll of 10 in the office) saying they’d chosen not to be shown people with children.
You can’t browse pictures or profiles – you wait to be matched by the mystery algorithm after answering the 400 questions – then you are guided through a contact process.
Some may think it lacks the spontaneity of other dating sites – and you certainly can’t use it to get a quick date for the weekend.
The price and process mean only the dedicated remain – but equally, can lead to people dropping out mid-process.
Controversy swirled in 2010 around its lack of same-sex matching resulting in a site launched later for gay and bisexual daters called Compatible Partners, but e Harmony now offers matching for both mixed and same sex couples from the main homepage.
However, they do have a live help service at their homepage to talk you through joining.
But size isn’t everything – as anyone who has just wrapped up a three-hour swiping session on Tinder will attest.
When she reduced her height to 5ft 9in, that rocketed to almost 2,000.