We did with Megan - a week or two before 6 months her sleep was dreadful, and part of what was making it so dreadful was that I couldn't ignore her - not that I was leaving her to cry, just that she'd shift about a bit during the night and I'd be on high alert for her 'pre waking' movements and start trying to keep her asleep - which would only wake her up and mean I was awake for long periods of the night. We moved her into her own room (a room she was v familiar with - we'd done all nappy changes & baths in there all the way along) and things got better very quickly - she (unsurprisingly) slept better when she was allowed to drift in and out of light and deep sleep without intervention, and actually within a couple of weeks she stopped waking for a nighttime feed.
However Eli is 6 1/2 months old and still in our room. Partly because there's nowhere really to move him to (we expected we would have moved house by now, so never bothered clearing out the spare/junk room to create a space for him), partly because I can't be bothered to move him, and partly because I rather like having him right next to me. He feeds once or twice a night (twice seems to be the norm at the moment) and often needs a little suck of my finger to get him back to sleep if he stirs in-between - or first thing in the morning when I don't want to get up yet. I'm worried that if we move him then I'll just spend less of the night in my bed and more time in a less comfortable position with my hand through his cot bars.
We'll probably give it a try sometime soon - clear a space in the spare room and hope that he finds the piles of junk interesting. He's right at the limits of being able to fit into the crib, and once we rebuild it as a cot, it's much harder to move between rooms, as it won't fit through the doorway like that. So probably we should put the crib in the other room as a trial - if it works then build the cot in there. If it doesn't then build the cot in our room.