I've never found out, we have 2 girls.
For me with #1 i REALLY wanted a girl, and we didn't have the anomaly scan, and my first scan was at 11weeks, so my later scans (which were for fluid levels after my due date as part of the bioprofile) i wanted to wait for the Big Day to find out. I was SOOOOO happy to be done giving birth, i'd have been thrilled if they'd handed me a tiger cub in a towel. With #2 i really THOUGHT she was a boy and was hopeful for one (though not TOO bothered), BUT i had friends who had a gender preference, found out, got the opposite of what they wanted and basically cried about it for the last 4 months of their pregnancy. I didn't want to go through that! I knew after the birth i'd have the "anything that i just pushed out is PERFECT" feeling, so i decided i'd wait to see what it was at the birth. We didn't have the anomaly scan that time either, but the 15 week scan we did have was super clear, i think the tech knew already when she asked if we wanted to know and we declined.
This time i'm undecided. I don't know when we'll be offered a scan as the policy has changed from 12 weeks (which due to waiting lists one tended to get around 15 weeks) and 20 weeks to 7 weeks and 20 weeks. I've had 2 bad dreams about trisomy 13, marked out by a big cleft palate. I'm 9 weeks right now but i'm going to talk to the tech whenever our scan is. If we end up being called in at 11 weeks (the 7 week scan wait list is even longer than the 12 week ones were, because of the number of ladies who will go on to miscarry still being pg at 7 weeks) and the palate isn't clear and whole then i'll have the 20 week scan to set my mind at ease. If i have a 15 week scan when it's easier to see if there's a problem with the facial bones or not and everything looks ok then i might skip the 20 week scan again. What we decide on THAT will decide what we decide about finding out the sex.
Part of me is tempted to find out because i never have, this will be my last kid, and i really DON'T have a preference this time (i'd LOVE a third girl, and welcome a first son, so either way we're set). Another part of me remembers the surprise and wonder of finding out i had a daughter each time i've given birth and worries that i'll taint that moment by knowing in advance. So we're still on the fence, basically!