If you are facing a dilemma about whether a live-in relationship before marriage is a good idea, then it's worth discussing the pros and cons before going ahead. A little more thinking will never hurt.
For many, this decision is made out of convenience and for many, it is something of a trial run before marriage. Opinions about it are divided. However, people who have never really gone through this experience before marriage, can only give an opinion which is theoretical in nature, rather than practical experience. It's entirely your decision.
The couple will get to know each other's idiosyncrasies, insecurities, plus and minus points, in more detail. This experience will either strengthen and affirm your decision to marry or force you to rethink. Either way, it's good to have this preview before taking the wedding vows.
It can solve a lot of practical problems. The couple can save on rent and conveyance costs if they live together. If there is understanding between you and your partner, things will definitely work out.
However, statistics can be misleading as there may be a variety of reasons for a couple reaching a divorce decision.
Society frowns upon people living together without marriage. The extent to which this fact bothers you is directly proportional to how much you care about what the society thinks. Whether you live together after or before marriage, problems are always going to be there in both cases.
To sum it all up, statistics and opinions are out there, but what you feel is right, you should go for it, as it's your life after all. What matters ultimately, is how much you understand and care for each other.
If there is tolerance about each other's shortcomings and respect for each other, along with that important ingredient called unconditional love, you will have a great relationship for sure.