My experience was very positive, and I've been on it twice, both times for horrible anxiety/depression after having my babies.
Did feel a bit zonked and slow for a few days but that soon went. Also had a tremor in my jaw for a couple of days and a dry mouth but these also wore off very quickly.
I found that I was much, much less anxious, more able to cope with crises, had a more positive outlook and was able to get on with my life, whereas before I took it I was just a wreck, sleepless, crippled with horrible, nameless anxiety and not able to be a good wife or parent to my boys.
I took mine in the morning too, as I was advised this would be better for me as one of my main anxiety symptoms was insomnia.
For me, the positives outweigh the negatives by a long, long way. I also found that I was able to come off citalopram without much trouble - I reduced very slowly, from 20 down to 10, then asked my GP to prescribe the liquid form which you take as drops so I could reduce very, very gradually. This was as much for my own peace of mind as any evidence that withdrawal would be a problem, but as you can probably tell Im' a bit of a worrier! I've been off this medication for over a year now and haven't looked back.