Moved out when I went to uni at 18 supporting myself by and large in my first year and completely after that, then about a year ago (22) split up with my now ex who I had moved in with and decided that since I was just mostly working on a final few essays and then my dissertation that I'd move back with the parents for a while so I could completely focus on my uni work, save some money and not have to take a part time job for the time being (which royally screwed my grades in 2-3rd year).
They were, and are, happy with it, wouldn't have done so otherwise but I'm still here right now trying to get everything sorted, as soon as I can though I'll be off. Love them but I really miss my own place and feel kinda bad about it as I was hoping only to be back for 6 months max.