I bought a nicely packaged diesel heater after season this year and plan for that to be an option next year.
Having said that, wife and I don't like to sleep with any kind of heater going really. For me partially I don't want to have to rely on any system that could fail, wanna be able to sleep without comfortably. We still bring the buddy heater and we'll run it for 15 mins or so before crawling into the sleeping bags and turning it off. Then in the morning when the alarm goes off I'll snooze it and fire up the heater, tent is toasty by the time snooze is up (10 minute snooze) for getting dressed. As stated previously do get a filter if running it on a big tank and stating the obvious be sure it's not too close to the tent walls or cots and sleeping bags to melt. They'll heat up a 10x14 flexbow or a 6 man Alaskan Guide in a hurry so might be too much unless you're dealing with some bitter cold or some wind. You can get battery powered CO2/Smoke detectors and throw them in a tent pocket or up in a loft.