i have mixed feeling on living together. i guess it depends on all of the circumstances...
i lived with my (ex)boyfriend for nearly 2 years. we'd only dated for 3-4 months before i moved in with him. the reason i moved in THAT soon was because i'd gotten a job offer in chicago, where he lived, and i wanted to take it but couldn't find a place that soon. i ended up staying after i got settled in and things were good for a while. however, i think it would've been better if we had waited at least a few more months to take that step.
i would suggest having a place small enough that family wouldn't feel inclined to intrude often. my ex's family was frequently staying with us, often without prior warning (they all had keys ugh) which lead to many fights.
the other thing i'd recommend is making sure you have receipts for all bills/rent you pay as well as a legal agreement about the living arrangements beforehand. i ended up having no place to live with only 3 days notice because i didn't take that precaution. *sigh*
overall, i think living together is a wonderful idea. i couldn't imagine getting married to someone without living together first!! sure, people have done it for years... but there are so many things you can't know about a person just by being together a lot.
i had fun and really learned a lot while living with my ex.
**i guess i should add that we broke up/i got kicked out because his mother is the biggest c_ _ t that i've EVER met in my life. she hated me for the stupidest reasons (i'm not filipino, i didn't go to college, i'm a vegetarian, i'm not ocd about cleaning 24/7, i didn't have a job she thought was good enough when i was a vet tech, etc.) and pretty much brainwashed her son into thinking i'm not good enough. we fought constantly because she visited a lot and always made rude comments to me but he always took her side of course, even when he witnessed her horrible behavior. she'd always ask him if i paid for this, if i paid for that... it was awful.
in the end, she came up to me (she was staying with us at the time) and said she had to tell me something... and she proceeded to tell me that "phil was afraid to talk to me so she had to do it" and basically broke up with me for him, then told me since the house was being put on the market i had to be out in 3 days (!!! WTF) so it could be vacant per the realtor. worst part? she LAUGHED during all of this.
he's been trying to get back with me but i say only if his mother is not ever around me. we'll see what happens...
sorry for getting so off topic! lol